Misc: In Disney's "Fantasia", the Sorcerer's name is Disney spelt backwards?

Questions

Alternative Tune:"and I'll cry for ___, yes I'll die for ___"?

Alternative Tune:"Hey, man you disrespecting me Take him out"?

Alternative Tune:"I know I'm being used, that's okay man cause I like the abuse"?

Alternative Tune:"I, ohhhhhhh, I'm still _____"?

Although his early career was snuffed out in the same plane crash that killed Buddy Holly, this east L A kid had a memorable top ten hit about his girlfriend, Donna?