Which animé has the catchiest theme tune?

[Rotting Corpse]

I know it's been said already, but for me it's gotta be the Naruto Shippuden intro GO! by FLOW.

http://www.youtube.com/watch?v=sdpB0Fdc19Y

And I swear that having met the band does not make me biased on this.

Also, Ready Steady Go from the first Fullmetal Alchemist series is one of my favorites.

http://www.youtube.com/watch?v=UDBQmtBFy8c

 

[Sabrestar]

Weirdly, despite never having actually seen the anime (which I think is a bit on the obscure side anyway) and not having heard the music in about 10 years, the theme to MAPS still gets stuck in my head on a great many occasions. Can't figure out why.

 

[MagnificentFiend]

I'm cheating, but Powerglove's version of the Pokemon theme is fucking PEERLESS.

 

[rancher of monsters]

I love the theme songs for both Cowboy Bebop and Samurai Champloo, but considering both anime were based off jazz, blues and rap, hip-hop respectively, I think they were kind of expected to have good soundtracks.

 

[Helios_(DEL)]

this is my lot
naruto shippuden
http://www.youtube.com/watch?v=cLP9fiHIBU8&feature=related

 

[Vandborg]

animé

Pokemon, over and over. Anyone who watched the anime as a kid knows all the words to that song.

I also nominate Digimon, it is damn catchy.

Or Beyblade!

Couldn't agree more. Surprised Beyblade didn't get mentioned earlier, it's awesome. But yeah, hands down, Pokémon in English got to be the very best.

 

[Ack-ack]

http://www.youtube.com/watch?v=QVgpzkAxXoc

And dont you dare to suggest otherwise

 

[GonzoGamer]

Definitely "Tank" from Cowboy Bebop - my favorite soundtrack of all time.

A close second would have to go to Ping Pong Club
And the show is hilarious.

Hellsing had a pretty badass theme song too.

 

[Folio]

I've seen some good ones. But now two spring to mind because I didn't seen them on the first page.

Spoiler: Ghost in the Shell

Spoiler: The heavy song of Bleach, Ichirin no Hana

Spoiler: Dragonball

Seriously! DBZ OVER Classic Dragonball?! That song never bored me. ARGH! It's in my head again! That will take month to get out!

 

[Shoggoth2588]

Fist Of The North Star

Do you mean Ai Wo Torimodose (You Wa Shock) or, Lu:Na? Both are really catchy but the original stuck with me more effectively than the one by Gackt...then again, I have a prejudice against Gackt.

---

Hokuto no Ken aside, there are many catchy themes like the one for Love Hina (which has burrowed into my brain like a botfly), Deathnote (I don't really like Maximum the Hormone but they have a couple songs I love), Detroit Metal City (Satsugai = Metal [well, it means Murder but it's so freaking awesome!]), Cowboy Bebop and, many others.

I can't commit to just one so I'll enter all-of-the-above.

Spoiler: Ai Wo Torimodoso - Fist of the North Star

Spoiler: Lu:Na - New Fist of the North Star

Spoiler: Love Hina opening

Spoiler: What's Up People!? - Death Note

Spoiler: Satsugai - Detroit Metal City

Spoiler: TANK! - Cowboy Bebop

 

[Jamiemitsu]

G GUNDAM.

http://www.youtube.com/watch?v=DlhtVgB7QuY

Honestly, it's the most epic thing ever!

Also, the dragon half ending, just for lulls:
http://www.youtube.com/watch?v=ODyIZhc29kM&feature=related

 

[s0m3th1ng]

This song is basically the only thing that got me through the endless eight.

Are you referring to that shit during the middle of the second season? Nothing has ever made me rage so much watching animation than that particular waste of animation.
NGE's got it for me. Just because it's so disconnected with the feel of the series.
HOTD is a good runner up and it DOES fit with the series.

 

[[Kira Must Die]]

Spoiler: Bokusatsu Tenshi Dokuro-Chan OP

Spoiler: Renai Circulation- Kana Hanazawa (Bakemonogatari OP 4)

Spoiler: Let Me Be With You- Round Table Ft. Nino (Chobits OP)

EDIT:

Spoiler: And although it's not the opening theme.

 

[graverobber2]

Spoiler: Rurouni Kenshin (opening 2)

 

[Your once and future Fanboy]

Lucky Star!

I dare you to not like the intro!

 

[Prof. Monkeypox]

Paranoia Agent.
It's just so damn catchy and creepy at the same time.

 

[Summerstorm]

Hm ok...:

Is it technically a badly mutilated and sewn back together FROM an anime american production? yes... but do i want it to count? FUCK YES!:

Can you feel the THUNDER inside?

SABER-RIDER and the Starsheriffs
IN THE SKY

Also other great ones were already mentioned.. i am not parotting everything again. Bebop, Hellsing, Ghost in the Shell etc.

Oh and also:
Gantz!

Hm, i don't like japanese lyrics (since i don't understand them) and electronic music... but this IS catchy:

 

[teebeeohh]

most of the bleach openings(i switched from anime to manga a year ago so i can't say exactly which ones )

oh and the first death note opening

 

[4484448444844484]

Code Geass OP 1; Colors by FLOW

Spoiler: JIBUN WO~!

 

[HellspawnCandy]

Cowboy Bebop, and to whoever said it first, you know what's up.