Ok, I guess these would be my favorites. I don't think I can name just ONE so..
Singer: Mika, Lady Gaga :$
Band: The Fratellis, Yeah Yeah Yeahs and Vampire Weekend.
These would be my least favorites:
Singer: Ke$ha, Eminem (Sorry :()
Band: ACDC
I'm not a fan of Biebs either but I can tolerate him.