King Dedede's Theme is my absolute favorite song in any video game.
http://www.youtube.com/watch?v=z3QRoUTAUco
I do like a few others though.
Revenge of Meta Knight
http://www.youtube.com/watch?v=LPPwdlgv2cs
Fountain of Dreams
http://www.youtube.com/watch?v=j_QToro5P-I
Battle with the Hag (Least I think that's what it was called in its score :x)
http://www.youtube.com/watch?v=0eKK3CZPKac
Bowser Battle Chorus
http://www.youtube.com/watch?v=RJqrQJr_vrc
Kamella
http://www.youtube.com/watch?v=ucsc3QDO6OY
The Ultimate Show
http://www.youtube.com/watch?v=Dd3y6Pci3g8
Francis Battle
http://www.youtube.com/watch?v=l0YfuCkT1VI
Solaris Phase 2
http://www.youtube.com/watch?v=vRe3h1iQ1Os
Theres a lot more... but I'll leave it at that :x
My Creations in Modnation Racers! Check zhem!
http://community.modnation.com/en-us/players/IvoYaridovich/creations
