Musicians answers level 11-20

Musicians answers level 11: Christina Aguilera
Musicians answers level 12: Kate Perry
Musicians answers level 13: Gwen Stefani
Musicians answers level 14: Britney Spears
Musicians answers level 15: Jennifer Lopez
Musicians answers level 16: Macklemore
Musicians answers level 17: Jason Mraz
Musicians answers level 18: Nicki Minaj
Musicians answers level 19: Avril Lavigne
Musicians answers level 20: Kelly Clarkson