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Here is a list of my favorite anime OST, OP, ED, etc. that I'd also recommend to fellow fans. Some I like for music, some for animation and some for both. It's going to be a long list in the end, so instead of sorting it by favorites or by year, I'll do a bit of both. To make navigation easier, classic anime titles are in purple and modern anime are in blue.
NOTE: Some of the music on youtube is sped up/slowed down, due to copyright reasons, so get the original OST for the best experience.
Plus, this list is a work in progress - it'll take me some time to add all the favorite's I've been listening to over the years.

City Hunter
80's music galore! This anime was just insanely packed with great tunes.
Footsteps: https://www.youtube.com/watch?v=EOW9f_Pdmjk - Whenever this came on you knew it was action time!
Secrets: https://www.youtube.com/watch?v=em9VqNjoEuI
Forever in my heart: https://www.youtube.com/watch?v=Ef2ZUsg3TBQ
Get Wild: https://www.youtube.com/watch?v=qIGjb18q2Ts
Go Go Heaven: https://www.youtube.com/watch?v=vu8ll4w530g
Running To Horizon: https://www.youtube.com/watch?v=FkiDM_xx-oA
Just Like Magic: https://www.youtube.com/watch?v=JLFx5AMmhZM
Angel Night: https://www.youtube.com/watch?v=2HYtSRpupig
Escape: https://www.youtube.com/watch?v=Ie5sK3hQX3g
Super Girl: https://www.youtube.com/watch?v=ZLJHrcyMaqY
Atsuku Naretara: https://www.youtube.com/watch?v=sjOj6ayn5tQ
Down Town Game: https://www.youtube.com/watch?v=GJzi9UBfUxw
May Be Rich: https://www.youtube.com/watch?v=EglJ1yON-Vk
Midnight Lightning: https://www.youtube.com/watch?v=uN7q-Ytc1B4
Want your love: https://www.youtube.com/watch?v=fxD3zQSHGlE
Never go away: https://www.youtube.com/watch?v=5HWCcYG_4gk
Suna No Castle No Casanova: https://www.youtube.com/watch?v=CjhOCc9574A
Earth: https://www.youtube.com/watch?v=UStItLx4jyc
Smile & Smile: https://www.youtube.com/watch?v=QSN4M-zQcH8
Machi-Juu Sophisticate: https://www.youtube.com/watch?v=9ebHE-w1Rv0
Sara: https://www.youtube.com/watch?v=ZN_C1obzzpg
Lonely Lullaby: https://www.youtube.com/watch?v=s_sGuqv44Qg
Chance: https://www.youtube.com/watch?v=vbxcqSIlB9U

Gunbuster
OP (Active Heart): https://www.youtube.com/watch?v=ZLhPBQpXafY - This OP will get you running.
Fly High: https://www.youtube.com/watch?v=rvzuRQD8XtM
March of the Exelion: https://www.youtube.com/watch?v=sEgcWquu_IA
Beyond the river of time: https://soundcloud.com/turbo-bosnia/beyond-the-river-of-time - The wonderful ending song, perfect for contemplating life and the vastness of universe.

Project A-ko

Follow Your Dreams: https://www.youtube.com/watch?v=NjbT1aHBYB4 . Listen to this every morning to stay healthy kids!
Morning Light type A: https://www.youtube.com/watch?v=sCW94L8Xjfs . If there's one melody that represents the 80's, this is it.

Tonikaku Kawaii
Koi no Uta, OP - this ethno techno mix goes into your ear particularly well

Dr Stone
Small Step - great voice and a great uplifting song
Stone Wars OP

No Gun's Life
OP - Motor City: https://www.youtube.com/watch?v=qM6kZNSJDH4 . This is the kind of riff that gets stuck in your head. Absolutely savage stuff from Kenichi Asai.
ED - Game Over: https://www.youtube.com/watch?v=1lnW7aZUvXM

Kemono Michi
ED - Anegdot: https://www.youtube.com/watch?v=i5QR1dUVFKE . So cute!

Ore wo suki
ED: https://www.youtube.com/watch?v=U5cnrqNfSJs . The way the music is coordinated with the visuals is somehow very satisfying, not to mention relaxing.

Ahiru no Sora
OP: https://www.youtube.com/watch?v=Tcgu_uoOmxI . You know shit's about to go down when a sports anime opens with a cool song like this!

Carole & Tuesday
This being a Watanabe musical anime it's not surprising it has insanely good music and animation.
OP - https://www.youtube.com/watch?v=Uj6H0LbjzKU
ED - https://www.youtube.com/watch?v=9Wa2Ki3AvIk

Shield Bro
OP 2 - https://www.youtube.com/watch?v=HutPrLMPWw0 . It's like an explosion, but both OP's have kick-ass animation. Shield bro has some amazing background music as well, made by Kevin Penkin.
OP - https://www.youtube.com/watch?v=jZvFEtR8RH0
ED 2 - https://www.youtube.com/watch?v=3WBB-jWrocQ
A touch of light: https://youtu.be/WUSz68hQ5_Q?t=59m45s
Quartet: https://youtu.be/WUSz68hQ5_Q?t=8m8s

Demon Slayer
ED - https://www.youtube.com/watch?v=NFCFJbkzKGI . I like the singer's voice and the song has some interesting elements right before the chorus.

Dororo (2019)
Both the OP and ED are wonderfully sentimental and sorrowful just like the anime itself.
OP - Kaen: https://www.youtube.com/watch?v=5DCGQ57ykME
ED - Sayonara Gokko: https://www.youtube.com/watch?v=UDow6LWVRYw

Vampire Hunter D: Bloodlust
ED - https://www.youtube.com/watch?v=58YYUto4PqU .

Legend of the Galactic Heroes
Gaiden OP 1: https://www.youtube.com/watch?v=jeARzaiZZTo - all of the LOGH openings are incredibly beautiful and sentimental, but this one has a special place in my heart.
OP 1: https://www.youtube.com/watch?v=KRtYuG6MgX8
OP 3 - Sea of the Stars: https://www.youtube.com/watch?v=CUf-8aXt9Hw

Promised Neverland
OP - Touch Off: https://www.youtube.com/watch?v=1JoFsTDfd-8 - quite the catchy pop tune, but also fierce!

Kaguya-sama (Love is War)
OP - https://www.youtube.com/watch?v=z33STjZpeMM - smooth!
ED2 - https://www.youtube.com/watch?v=5_fMtLWehRo - Chika's cute dance!

Goblin Slayer
OP - https://www.youtube.com/watch?v=SaUdpoLSTO4 . Listen to it, all of it! It's just the right background for slaying a horde of goblins!

Bunny Girl Senpai
ED - https://www.youtube.com/watch?v=K1PCl5D-IpU . This multiple VA version is just mesmerizing.

SAO Alicization
OP - https://www.youtube.com/watch?v=kBUkTavYOjY . It looks and sounds amazing. I mean it's hard to top "shiny sword my diamond".

King's game
OP - https://www.youtube.com/watch?v=RzlmnDU5VrM . Feed the fire!

Bakemonogatari, etc.

• Mousou Express video , full with subs - My favorite from the series. There's just something delightfully crazy about it. Make sure to turn on the subs.
  
• Perfect Slumbers - My 2nd favorite. It's amazing how well the music and the words capture the characters. There's a special bond between Araragi and Hanekawa and listening to this makes me both sad and bewildered.
  
• Chocolate insomnia - Another fabulous OP for Hanekawa! This one is quite uplifting, but there's still lingering sadness and nostalgia.
  
• Platinum Disco - This traditional folklore style OP fits Tsukihi and the quirky relationship between Araragi and his sisters all too well.
  

Urusei Yatsura
Spanning over a decade, with nearly 200 episodes and several movies and OVAs, Urusei Yatsura has a heap of great 80's tunes. I'll try to limit it to a small selection here.

• Born to be free - OP from "Movie 3: Remember my love". This energetic and surprisingly long opening is sung by Steffanie. The emotional ending to this movie is sung by the same person. True to Rumiko Takahashi's fashion, the OP is filled with a huge amount of characters.
  
  
• Rock the planet - TV OP 5. Live performance. Another wonderfully energetic song sung by Steffanie. This OP has all kinds of crazy things going on - watch out for Lum's awesome 3-stage power up in the beginning!
  
  
• Ai wa boomerang - OP/ED from "Movie 2: Beautiful Dreamer"
  
  
• Opening - from "Movie 4:Lum the Forever". A purely instrumental upbeat OP with Lum jogging through the town. This movie also has a heart felt ending song
  
  
• Inaba the Dream Maker OVA OP. The perfect beat for the summer. And a stylish ending to go along with it.
  
  
• Cosmic Cycling - TV ED 3. Possibly the most defining UY song. This is where the series really started to heat up.
  
  
• Triangle love letter. A very 80's beat, one of my favorites.
  
  
• Koi no Mobius - TV ED 6.
  
  
• Open Invitation - TV ED 7.
  
  
• Pajama Jama da - TV OP 3.
  
  
• Tonogata Gomen Asobase - TV OP 6.

Cutey Honey
'79 - https://www.youtube.com/watch?v=jCX77Je16fk . The groovy original, just listen to that bass line!
Flash - https://www.youtube.com/watch?v=SnBDQYuMrCc . The fan favorite, the trumpets at the start are just so catchy!
Shin - https://www.youtube.com/watch?v=AjejHGuIEro . This one has the best "onega-i"!
Re: - https://www.youtube.com/watch?v=EU3V0Nlj-IU .

Nodame Cantabile
OP: https://www.youtube.com/watch?v=_65IPFXarfQ
ED: https://www.youtube.com/watch?v=apb6EgcsLlQ
Nodame could easily be my favorite anime just for the OP alone, with it's awesome positive progression. Seriously, this OP descends on you like a thunderstorm.

Hinamatsuri
OP - Distance: https://www.youtube.com/watch?v=tJVAkofTFbI - I love the refrain on this song, they certainly took an interesting pitch on some of the notes.

Darling in the Franxx
ED - https://www.youtube.com/watch?v=VD_JhspDBIg . The violins are great.

7 Deadly Sins
Season 2 ED - Beautiful by Anly: https://www.youtube.com/watch?v=oTQKvvmKDts

Udon no Kuni
OP - https://www.youtube.com/watch?v=I4eJDEf7Sqs .

One Piece
When One Piece first started out (and had a more relaxed production schedule) the team behind it was able to create an amazing soundtrack that paired well with the beautiful hand-drawn pastel background.

• We are! - The most famous tune from One Piece that every true pirate must sing to!
  
  
• To The Grand Line - The Grand Line, the great sea where destinies clash, are made and broken! This melody brings out the tears, even if you don't want to shed them.
  
  
• Crazy Rainbow Star - One of the most upbeat openings. The video is awesome too, just Straw Hats chilling and doing funny things!
  
  
• Bon Voyage - Another great opening, that has both emotional moments and Straw Hats chilling.
  
  
• Mirai Kokai (full) - A very relaxing ending.
  
  
• Before Dawn (full) - A very much 90's ending, with great energy behind it.
  
  
• Run, Run, Run - An even more 90's ending.
  
  
• Fish - Another energetic ending, this one is more reminiscent of the 80's.
  
  
• Good Bye Alabasta - I'm not crying dammit, real friendship is eternal!
  
  
• Nakama no Shirushi da - Friends, let us go on a grand adventure! 1:37 will make you cry T_T .
  
  
• Hurricane Girls - it's Nami and Robin at their coolest, it's impossible to dislike this!
  
  
• Ikari Wo Kureyo - The One Piece Gold movie ending. Glim Spanky will blow your ears out with this soul-shredding goodness.
  
  
• Soul Pocus - an amazing and very emotional ending to the WCI arc.
  
  

Wolf Girl and the Black Prince
ED - Wolf Heart, Oresama: https://www.youtube.com/watch?v=PwAgOqNvFGA - the amount of stuff drawn in this official video is bonkers.

Golden Time

• Sweet & Sweet Cherry - This ending is so cute and upbeat!
  
  
• Ending 2 - Cute! I love all the sounds they put in, that clapping is contagious.
  
  
• World's End - Amazing composition and video. My heart feels like thumping when I listen to this.
  
  

Re:Life
ED 1-12: https://www.youtube.com/watch?v=PhRn40Nal5I .
Do you have time? Amazingly enough this show has 12 different ending songs. They're all very fitting with the daily high school theme, but my favorites are ED 2, 5, 6, 7, 10 and 11.

Erased
OP - https://www.youtube.com/watch?v=Y9G20wV0KHE .

DNA2
OP - https://www.youtube.com/watch?v=3_qDeRf7Ez0 - incredibly catchy and amazing

Sakurasou no pet na kanojo
ED 1 - https://www.youtube.com/watch?v=5p4WoJ86Xo0 . "I'm a dreamer!" gets me every time.
ED 2 - https://www.youtube.com/watch?v=03l1_eivte8

Oreimo
ED (PSP game) - https://www.youtube.com/watch?v=pM_2avJHYMM . The anime has many ED's, but this one is my favorite. It's so nostalgic and the drums are catchy.

Perfect Insider
Both the opening and the ending are quite a sight.

Gangsta
The opening just blasts you away with acid colors.

Prison School
OP - https://www.youtube.com/watch?v=O-UWCu7v-3I . The perfect delinquent theme.

Ping Pong the animation
OP - https://www.youtube.com/watch?v=Px9FvddtgpM . So intense it'll rip your pants off your butt.

Genshiken
Nidaime ED - https://rutube.ru/video/5cbc1a8140769b0f9b8e2bf4eadee438/ . Unfortunately I don't have any other link, because it keeps getting deleted. This ED was incredibly catchy, I had to listen to it every single time it came on.

Itazura na Kiss
OP: https://www.youtube.com/watch?v=tXP2H4hXIq4
ED: https://www.youtube.com/watch?v=iamocE3eTcw

Bubblegum Crysis
There's a hurricane tonight: https://www.youtube.com/watch?v=ajTAnMqhZB8 . Oh yes there is!

Infinite Ryvius
OP - https://www.youtube.com/watch?v=PgCuDFLN0WE .

Adieu Galaxy Express 999
Sayonara: https://www.youtube.com/watch?v=puzIkcDzWUc - one of the best anime movie endings ever. Adieu GE 999 is a masterpiece you just need to soak in with all of your senses.
Main theme: https://www.youtube.com/watch?v=DfYpkE7BB98
Love theme: https://www.youtube.com/watch?v=nZkWyOlvLhM

Fushigi Yuugi
Tokimeki Doukasen - ED: https://www.youtube.com/watch?v=cfQqamu90Wg
Instrumental: https://www.youtube.com/watch?v=2k9kVChSl4Y
Miyaka Action theme: https://www.youtube.com/watch?v=JVjREzKeMxk
Not for the feint of heart, this anime is quite a roller coaster of emotions, though I kept coming back for that ED.

Gundam
A few songs from the huge Gundam franchise.

• Beyond The Time - Char's counterattack ED: https://www.youtube.com/watch?v=xE6SAE1tCEE . Perhaps my favorite Gundam song - it's an emotional ending to a great story that transcends time and space.
  
  
• The Winner - Gundam 0083 OP: https://www.youtube.com/watch?v=gsw0bP7A3Ko . This Top Gun styled theme is bound to get your heart racing.
  
  
• Gundam 0080: War in the pocket. This one has so much great music I could just recommend the entire OST! Consider these:
  OP - https://www.youtube.com/watch?v=yCZW542eJsg . Very nostalgic.
  Imaginary Sky - https://www.youtube.com/watch?v=GYCrluZwiUk . Chilling, listen to the battle start at 1:10 .
  To the North - https://www.youtube.com/watch?v=T8w4VwkFCPA . Nearing the end of a journey.
  Blue Moon - https://www.youtube.com/watch?v=r7bz4rZvacA . Something like a deep space ballad.
  Chasing the rainbow - https://www.youtube.com/watch?v=CAfbBfbI5BE . The ending song. This one will always make me cry.
  
  
• Eternal Wind - Gundam F91 theme: https://www.youtube.com/watch?v=WAtmewjEaIY .
  
  
• Gundam Unicorn theme: https://www.youtube.com/watch?v=b40mZVnQCTs . Unicorn has a fantastic OST, though it's mixed so well it's hard to single out specific songs.
  
  
• Gundam Reconquista in G - ED: https://www.youtube.com/watch?v=PXWkyRwirlk . The show is as wacky and nonsensical as a Tomino show can get, but the ED song is catchy as hell.
  
  
• Gundam Thunderbolt S2 - OST, Iroaku: https://www.youtube.com/watch?v=XecGcEUV0l0&list=PLRxrgKOXr0nF7KAK264ErBMzMeLt8Kcdl&index=10 . Thunderbolt has a lot of great music and this track displays that amazing riff and vocals.
  

Space Adventure Cobra
Daydream romance by Shigeru Matsuzaki - Movie OP: https://www.youtube.com/watch?v=6f-90pdNvKg (video, with English dub).
Absolutely breathtaking opening. Do yourself a favor and listen to the Japanese original which fits perfectly with the video.

Dirty Pair - Project Eden
Safari Eyes OP: https://www.youtube.com/watch?v=uM3O_EX1hCI . Another absolutely wild OP.
Through the danger: https://www.youtube.com/watch?v=B6FC6UMhLRI .
Matters to me: https://www.youtube.com/watch?v=5woZYHckBOM .

Food wars
OP - https://www.youtube.com/watch?v=Fh6bTCZGDuo
ED - https://www.youtube.com/watch?v=Fm-rPMVnBQE
A bit NSFW-ish, but both intriguing visually and audibly.

Brynhildr
Dubstep and metal, both OP's are pretty glorious.
OP1 - https://www.youtube.com/watch?v=Y01IKFq3k2Y
OP 2 - https://www.youtube.com/watch?v=KRvAQ0HweOU

Death Parade
OP - https://www.youtube.com/watch?v=UjjTMNDZi-A . Though I prefer Death Billiards, there's no escaping this catchy OP.

Lupin III

• Revolver fire: https://www.youtube.com/watch?v=c3tlslGPwWI . The latest movie Daisuke Jigen's Gravestone had a really cool ending song.
  
  
• 70's theme: https://www.youtube.com/watch?v=g9CyKNT8d-w . The famous, instantly-recognizable Lupin theme. Of course there are many variations besides this one.
  
  
• '89 theme: https://www.youtube.com/watch?v=_3W5C3bTbUA .
  
  
• Fire Treasure: https://www.youtube.com/watch?v=lUfFUegH1LA . The ending theme to the magnificent Castle of Cagliostro movie.
  
  
• Monkey Majik: https://www.youtube.com/watch?v=tm9aHdR6yS4 . Just listen to that bass line. Part of the Lupin the Third Dance & Drive album.
  

Angela
Instead of listing separate anime, I'll just list all the songs made by Angela here. Whenever I see their name on a new anime song I know it's going to be great.

• Valvrave ED 1 - Boku Janai: https://www.youtube.com/watch?v=egYJt353__A . The anime was sure filled with random craziness, perhaps that's why this ending is so fitting.
  
• Coppelion OP - https://www.youtube.com/watch?v=bO5r5YJrgJY
  ED - http://www.dailymotion.com/video/x1637hp_coppelion-ed-tooku-made-by-angela_music
  
• Knights of Sidonia OP - https://www.youtube.com/watch?v=51LMOJu9lwc
  

Watamote
OP - https://www.youtube.com/watch?v=gZYq7rat9d4
ED 4 - https://www.youtube.com/watch?v=64ZpTlwILyI . Vocaloid on rampage.

Asterisk
Waiting for the rain, ED - https://www.youtube.com/watch?v=kxi19mhpLrU .

Barakamon
ED - https://www.youtube.com/watch?v=pffJj1Bca1s

Baby Steps
OP - https://www.youtube.com/watch?v=2wSWky127PE

Maison Ikkoku
Hello Sadness - OP1: https://www.youtube.com/watch?v=znCRPdCabvQ .
Get Down - ED: https://www.youtube.com/watch?v=AylWPzelKtY . They only used this ending once, possibly because they didn't get the copy rights for the song.

A town where you live
ED - https://www.youtube.com/watch?v=A9IW_ZAhR3s
Hosoya's velvet voice makes this ED.

Attack on Titan
OP - https://www.youtube.com/watch?v=XMXgHfHxKVM
ED - https://www.youtube.com/watch?v=lOOMbMhiCRs
When AOT came out, the OP caused quite an euphoria which resulted in a lot of parodies being made. The ED is perhaps even more amazing, with great emotions and instrumental inserts behind it.

World god only knows
OP - https://www.youtube.com/watch?v=KZBgRDMyXzw
The anime might not give it away, but the full OP is an amazingly lengthy composition with the melody and rhythm changing up several times.

Idol Densetsu Eriko
If you're looking for a defining 80's OST, this has to be damn near the top. It pretty much consists of top-level idol songs. Just listen to Eriko's voice, it's clear as a glass!
Suki yo: https://www.youtube.com/watch?v=LrbvRBNST_k
Locomotion dream: https://www.youtube.com/watch?v=cP3TWVlDSMY
Watashi wa soyokaze: https://www.youtube.com/watch?v=Vw5hveWpN2w
Honki: https://www.youtube.com/watch?v=S-5nLZN-1TA
Namida no hanbun: https://www.youtube.com/watch?v=VU3hGvNg5cU
Rolling Nite: https://www.youtube.com/watch?v=3MlNL1U0DHY
Unchained Heart: https://www.youtube.com/watch?v=28R3tcWDcW8
Blue Moon: https://www.youtube.com/watch?v=hKhqJT_62Ko

Creamy Mami
This was the musical and magic girl anime of the early 80's, much of which is owed to Takako Ohta's crystal clear voice. And obviously Megumi's thunder slaps.
Binkan Rouge: https://www.youtube.com/watch?v=-iJRh83AjW8
Pajama no Mama de: https://www.youtube.com/watch?v=NgkYaWlLd7o
Love Seringaku: https://www.youtube.com/watch?v=U9CD2gSGkmk
Beautiful shock: https://www.youtube.com/watch?v=M2XQBHPhA3o
Delicato no sukishite: https://www.youtube.com/watch?v=7YvEM0BdjBo

Boys Over Flowers
OP: https://www.youtube.com/watch?v=RvZ_f9umldU - Makino kicked ass and so does this OP which involves some crazy dancing
ED: https://www.youtube.com/watch?v=3AY9jqUR2P0
ED2: https://www.youtube.com/watch?v=LxmJsLdBqE0

Marmalade Boy
OP: https://www.youtube.com/watch?v=e6oYHRfMJTo - The famous OP and basically the whole OST was ridiculously catchy, as befits any proper shoujo show.
ED: https://www.youtube.com/watch?v=3YzKdSGVuGA
ED2: https://www.youtube.com/watch?v=zySfBTWKEvc
ED3: https://www.youtube.com/watch?v=i84AM39dTuw
Moment: https://www.youtube.com/watch?v=-saiR-7n_n4
Rival Arimi: https://www.youtube.com/watch?v=oSXN2qfnLQs&list=PLsav_WUvecfNgAkCVgM5yc3PthdayIOMV&index=15 - My favorite of the lot. The best song for the stormy girl!

The dagger of Kamui
OST: https://www.youtube.com/watch?v=DcIMEnoyOrY&list=PL2pvCDABDYJahrYKIJXFRuC8XaDOhuFxc - a ridiculously good mix of ethno rock.
Kamui no Ken: https://www.youtube.com/watch?v=tcl-wYxDzJg&list=PL2pvCDABDYJahrYKIJXFRuC8XaDOhuFxc&index=13

Black Lagoon
OP - https://www.youtube.com/watch?v=T9GfkiZPnm8

Salaryman Kintaro
OP: https://www.youtube.com/watch?v=9XQg_GRPeJU - this is one of those weird obscure anime that have a pretty good OP.

F - エフ
ED - https://www.youtube.com/watch?v=EJH2DfZoJEU .

Burst Angel
Jou no theme: https://www.youtube.com/watch?v=REsIOCdjLr0
Jou no theme 2: https://www.youtube.com/watch?v=CM58YRxwGcQ

Geneshaft
New order: https://www.youtube.com/watch?v=TwGlTRZE-oI&index=8&list=PLF84CF41FE26CBDCD

Gunsmith Cats
OP: https://www.youtube.com/watch?v=J7HPyUcy37I
Do it Minnie May!: https://www.youtube.com/watch?v=E_vk_DGFLFU - well, how often do you hear female Japanese rap xD?

Fantastic Adventure of Yohko (Leda)
Kaze to Bouquet no Serenade: https://www.youtube.com/watch?v=k0MRNrp9pBs&index=12&list=PLY37OB8VljQjIjvQB0RH_p2XMwzydP9xE

Orguss
OP - https://www.youtube.com/watch?v=3RjKv8J1y4U
ED - https://www.youtube.com/watch?v=lnrwEJn0k30
It's the slightly cheaper version of Macross, but you have to appreciate it's style. And that ED which doesn't have much to do with the anime itself.

Cosmo Police Justy
ED - https://www.youtube.com/watch?v=CfCO8rmm1GY

Tokimeki Tonight
OP - https://www.youtube.com/watch?v=ffkxBqj3mCU .
ED - https://www.youtube.com/watch?v=DmxkoaPW23w .
One of my favorite comedies, even though the production was really wonky at times. You can't deny the uniqueness of that OP and ED.

Megazone 23
Having it's own idol - Eve Tokimatsuri - of course Megazone 23 had a bunch of catchy songs, yes even the shoddy made Part III.

• Sentimental: https://www.youtube.com/watch?v=HABztzndFi4
  
• Please tell me the secret: https://www.youtube.com/watch?v=TcErT0fCWT8
  
• You can't sleep alone: https://www.youtube.com/watch?v=HAAUe6jcWaE
  
• Lonely sunset: https://www.youtube.com/watch?v=YYLj7bm0unA
  
• Idol of tragedy: https://www.youtube.com/watch?v=S4CGRkMJQXM
  
• Beauty of sleepless forest: https://www.youtube.com/watch?v=A_NHsqnPlm0

Black Heaven - Hard rock save the space
OP - https://www.youtube.com/watch?v=DFOF9acNUH8

The "I don't know where I found these but they might be NSFW" category
Ahem, seriously, I just happened to find these by chance!

Lastdun - ED - https://www.youtube.com/watch?v=CEZIOZ_lHbQ .

How not to summon a demon lord - ED - https://www.youtube.com/watch?v=ZHA6k4kZT-g . I have a particularly soft spot for the "Anata-ga suki" and "Guchagucha" part haha. There is also a slightly less censored version without the chains and cookies ^_^ .
Full version: https://www.youtube.com/watch?v=BPpxllu5PeM .

Kiss X Siss - Steady Boy ED - https://www.bilibili.com/video/av464318/ . The full, 4 minute dance, it just keeps going! This has been copyrighted to hell and it's very hard to find out in the open ಠ_ಠ .

Highschool DxD OP 1 - https://www.youtube.com/watch?v=0EHne2id_Kk . Listen to that legendary opening riff.
Highschool DxD Born ED - https://www.youtube.com/watch?v=zEE9YbeUhek . I love the "do-you do-you" part. Also when the reggae drops in.

Hajimete no Gal ED - https://www.youtube.com/watch?v=Y8CfH-VXxOQ . I always find the high school garage band sounding productions amusing and surely this ED has a bunch of beats and melodies mashed in. It's also cute how the singer says "a-ta-ta-ke nai."

Cool post man