Are Pete Loeffler and Chris Robinson both singers in American rock bands?
Pete Loeffler: Pete Loeffler (born October 19, 1976) is a musician, known for his work with the Chicago-area rock band Chevelle, for which he is the lead vocalist and sole guitar player. Chris Robinson (singer):  He was the singer of the rock and roll band The Black Crowes and brother of its guitarist Rich Robinson.
yes