The beginning songs for KH 1 and 2 were pretty good. I'mnot sure if they werre mde just for the game though.
"Gwen Stefani 1969-2009
Murdered by Afterstasis, who said "I Killed this *****, she had it coming. I know how to ****ing spell bananas." -Quinarvy
Both Passion (Sanctuary) and Hikari (Simple and Clean)
Hikari was made for Kingdom Hearts but it was also released on an official album as well as Passion. Both of which released as singles about a week before the game the song was in :P