While influenced by the counterculture of the 1960s, Summer became the lead singer of a psychedelic rock band named Crow and moved to New York City. Joining a touring version of the musical "Hair", she left New York and spent several years living, acting and singing in Europe, where she met music producers Giorgio Moroder and Pete Bellotte in Munich, where they recorded influential disco hits such as "Love to Love You Baby" and "I Feel Love", marking her breakthrough into an international career. Summer returned to the United States in 1975, and other hits such as "Last Dance", "MacArthur Park", "Heaven Knows", "Hot Stuff", "Bad Girls", "Dim All the Lights", "No More Tears (Enough Is Enough)" (duet with Barbra Streisand) and "On the Radio" followed.