Okay so this blog post is about sharing your opinions about the best song sung by each character or, if the charcter seldom sings or doesn't sing at all, the best song that they appear in.
So in my opinion:
Ferb-->My Ride From Outer Space; Spa Day
Candace-->E.V.I.L. B.O.Y.S.; Busted
Perry-->*EVERY SONG HE APPEARS IN!*--just can't decide; he looks cool in every song he's in
Doofenshmirtz-->Back In Gimmelschtoomp
Stacy-->Disco Miniature Golfing Queen
Baljeet-->Give Me a Grade
Buford-->He's a Bully
Vannessa-->Busted; I'm Me
That's all. Other characters seldom sing.