i can play expert on all instruments(including pro mode for drums) and i honestly dont care what difficulty u play as long as u dont suck(i.e. always in the red on the crowd meter) on said difficulty. most songs i own are metal,but ive got a good number of other genres. and just to add,when i play bass/guitar,i dont follow the unwritten rule of:"the guitarists switch guitar and bass after each setlist" rule. if im playing guitar,i stay on guitar and vice versa.