He toured for forty-five 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".

In 2010 McCuller joined the Troubadour Reunion Tour supporting James Taylor and Carole King.

McCuller has had numerous acting parts in films, particularly in movies centered on music, such as American Hot Wax (1978) and The Hollywood Knights (1980).

Although he did not appear onscreen in Duets, his vocals were blended with those of actor Andre Braugher to make a composite singing voice for the character "Reggie Kane"; in the film, Reggie Kane sang with Paul Giamatti on "Try a Little Tenderness" and performed an a cappella version of "Free Bird".