Knepper also played in the pit orchestra through the entire run of the Broadway show "Funny Girl", with Barbra Streisand, and later, Mimi Hines. After seventeen previews, the Broadway production opened on March 26, 1964, at the Winter Garden Theatre, subsequently transferring to the Majestic Theatre and the Broadway Theatre to complete its total run of 1,348 performances. In 1967 and 1968, he played in the pit orchestra at the Mark Hellinger Theater for "An Evening with Marlene Dietrich", for which Dietrich received a special Tony award in 1968. He also appeared on and off Broadway in "On Your Toes", and "The Me Nobody Knows".