IMO it has to be revenge of shinobi...

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Im going to have to go with Katamari Damacy.

I loved the music on the very first need for speed. It was something new and different at the time.

I like the music in Wipeout XL!

Bionic Commando Rearmed

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Persona 3's music gets stuck in your head.

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GTA San Andreas.

Some of my favourites:

Alex the Kidd
Sonic
Mario ( Any game )
Zelda ( Any game but Ocarina of Time, especially )

Legend of Zelda.
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beautiful.

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Sonic 3: Carnival Night Zone (Genesis)
http://www.youtube.com/watch?v=qjLfJFKiSI0

Ferrari F355 Challenge (Dreamcast)
http://www.youtube.com/watch?v=uU-RqdlFvzo
Gay 80’s Rock FTW

Rez: Final Boss (Dreamcast)
http://www.youtube.com/watch?v=l45uRuIjF_Y

Majora’s Mask: Green Bay Temple (N64)
http://www.youtube.com/watch?v=HuFL-4jal1o

SSX Tricky: Finished Symphony (PS2)
http://www.youtube.com/watch?v=4z0CiLbUvi0&feature=related

GoldenEye: Soviet Missile Silo (N64)
http://www.youtube.com/watch?v=o-1PS...eature=related

Final Fantasy VII: One Winged Angel (PSX)
http://www.youtube.com/watch?v=4hWT8...9A74&index=175

And the best of all time

Sonic CD: Collision Chaos (Sega CD)
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Zelda series, Final Fantasy series and GTA San Andreas. I especially like the reggae song from GTA San Andreas.