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this or at least this

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I'm sorry but i gotta add one of my old school favs

Try that 800% slower...

http://soundcloud.com/xihilisk/still-alive-from-portal-slowed-down-800

oh god good ol portal just hearing that song pushes my portal hype up lol...

To remember the good old times

and some Magaman X love

You hit the nail on the head.  The OP started things off on the wrong foot and everyone now is just throwing in their favorite music piece.  SONGS, people, SONGS.

Anyway, dunno if its the greatest but there is probably no video game original SONG that makes me feel happier than this (and yes I posted both original versions just to be relatively comprehensive; the first is a teaser for the 2nd, as completionist know).

You can't argue against this!

sorry, if songs require lyrics, then i will choose this one from Guitar Hero III

EDIT forget the one above, THIS is my choice:

I don't know how to post youtube videos but if I could I would post Father & Son by Harry Gregson-Williams from the MGS4 soundtrack cause it's just so inspiringly beautiful.