I prefer these...

Shakugan No Shana 1st opening theme :) -

http://www.youtube.com/watch?v=UVa32euRmeQ

If you look at the variety(different versions) Lupin the 3rd will probably be at the top.
The music used for season two opening have so many versions it is impressive to say the least.

Original


Tokyo Ska Par Orchestra version


With Lyrics version


Jazzy version


and much much more.

Azumanga Daioh opening theme (I LOVE THIS! SUCH A FUN SONG) - :)

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

Just filling in the blanks here, the song is called "Soramimi Cake". And it is a pretty memorable song both for its series and for being a pretty random song itself.

On the AzuDai note, I'd also toss in the ED song, "Raspberry Heaven".

And since I'm thinking of it, here's another recommendation:

Motteke! Sailor Fuku - OP song from Lucky Star

Open Your Mind - Yoko Ishida - Ah! My Goddess opening theme :) -

(Such a beautiful song)

http://www.youtube.com/watch?v=oj-gT2kqeEw

This song is a classic, I can't even find a video that has the ED and the song together:



Koibito ga uchujin nara (If My Lover Was An Alien) by Junko Iwao


This is a more recent one that's really grown on me even though the anime just ended a week ago:



Oren-ji by Rie Kugimiya, Yui Horie, and Kitamura Eri

And this one is a personal favourite that is also my ringtone:



Akane-iro Hometown

Personally i'd restrict this thread to songs at least 10 years old, given that it would me, rom my pov the bare minimum a song would have to stay in people's mind to say it has endured the test of time (otherwise the "of all time" part of the thread title holds little meaning) is the time for a school generation to completely change over (being 10 years the time it takes more or less to go from junior high to finish college. If the people from the next generation still like it it endured the test of time alright.

I see where you're coming from, but I have to disagree. I don't think a song needs to be X years old to be considered memorable, if not the "greatest of all time" as the thread title suggests. Consider the anime that have come our way this decade and some of the extremely memorable songs that have come with them. Why would we leave them out of the mix just because they're not old enough?

Because you might love a song one day and then a year down the road you might look back and wonder what you saw in it. If an older song is still highly regarded it's probably not going anywhere.

I totally wanna try and get it from somewhere to put onto mine aswell :)

Also this following one aswell ;)

Forever - Savage Genius - Elemental Gelade opening theme :D -

http://www.youtube.com/watch?v=dtIrtW1_J3w

The problem with anime music is that after listening to too many of them they'll tend to end up sounding all similar and generic. =P

That said, not sure if it counts but atm I find Animetal's cover of Iron Leaguer's OP pretty catchy:

Their Pegasus Fantasy cover is pretty good as well.

Mahoromatic: Automatic Maiden opening theme (sorry, can't remember what it's called) :) -

http://www.youtube.com/watch?v=jhlsyb143oI

Before we discuss anything more, what is your definition of memorable? (in terms of music of course)

Blaze by Kotani Kinya - Tsubasa Reservoir Chronicle 1st opening theme - This is GOOD :) -

http://www.youtube.com/watch?v=tVzrWXh-dYk

Another 10 suggestions from my top 50. *Same as the previous suggestions, beneath the videos are the links to the real person behind the music except for the 2nd suggestion didn't find the real person's live music*

0) Hoshizora No Believe by Mami Ayukawa from Gundam Zeta Ending Theme 1985

1) Tenshi No Yubikiri by Mai Fukuda from Kare Kano Opening 1998


2) Sakura Saku by Megumi Hayashibara from Love Hina Opening 2000


3) Sakura Saku Mirai Koiyume by Yozuca from Da Capo opening 2003


4) My Pace Daiou by Manzo from Genshiken Opening 1 2004


5) Innocent Starter by Nana Mizuki from Magical Girl Lyrical Nanoha Opening theme 2004


6) 88 by LM.C from Katekyo Hitman Reborn Opening 4 2006


7) Donten by Does from Gintama opening no.5, full version episode 105 ending 2006
*Youtube removed the 3m viewed version*


8) Modokashi Sekai No Uede by Makino Yui from Welcome To The NHK Ending no.2 2006


9) Paradise Lost by Chihara Minori from Ga-Rei Zero opening theme 2008

As far as music goes, to me something's memorable if it makes such an impression in my mind that I simply can't forget about it. Typically that kind of impression is a good one, though they can be not so good as well. Take, for example, Lucky Star's OP, "Motteke! Sailor Fuku". Even now hearing the song is pretty jarring to me at times simply because it's so high energy so it's hard for me to say that I really like it that much, but it's quite memorable nonetheless.

For me, music is made memorable by the memories it creates wherever it's heard :)

Haruka Kanata by Asian Kung-fu Generation - Naruto opening theme (second series) :D -

http://www.youtube.com/watch?v=71oAraBJfS8