Answwers are all well known bands or artists
1) 2 quarters
2) Lucky in a southern diet
3) A good view for working men
4) Happiness doesnt come from multiplying
1. is definitely 50 cent (as in 2 US quarter coins) who recorded Candy Shop etc and worked with Eminem I recall. (50% was a good mathematical answer percent but there is no such artist to my knowledge)