"Let Me Be," written by P.F. Sloan, recorded by The Turtles, can be heard as the nuns exit the Volkswagen Van, also known as a VW Bus, while Sister Ingalls thanks their driver. The single, released on White Whale Records, reached #29 on Billboard's Hot 100 in the U.S. in 1965.
The song playing in the end credits is "Where Have All The Flowers Gone" and is commonly referred to as an anti-war song used during the 1960s to protest the Vietnam conflict - something that Sister Jane was a part of. The song was released in the 1950s, but it gained most of its popularity in the 60s, so Sister Jane would have been aware of the song and its anti-Vietnam connotations.