Although a singer with a solo career in his own right, McCuller is perhaps best known for his work as a back-up singer for such better-known artists as James Taylor, Phil Collins, Beck, and Bonnie Raitt. He has toured for some twenty years with Taylor and is an audience favorite for his featured vocal parts on the songs "Shower the People", "I Will Follow", and "Is That the Way You Look". He has also toured extensively with Collins and is one of the main lead vocalists on the live version of "Easy Lover".
His song "Nowhere to run" was featured in the 1979 action movie the Warriors
McCuller also performed the song "Nowhere to Run" for the 1979 film The Warriors and was one of the four singers in the "guitar duel sequence" on the 1986 film Crossroads.