Rosemary Ann Butler is an American singer. She began her career playing bass guitar and singing in an all-female band named the Ladybirds while attending Fullerton Union High School in Fullerton, California. The band appeared on several Los Angeles area television shows before opening for the Rolling Stones in 1964. She then joined all-female psychedelic rock band the Daisy Chain in 1967 and the all-female hard rock band Birtha in 1968, the latter of which released two albums for Dunhill Records. After they split in 1975, she became a popular back-up singer in the late 1970s and early 1980s. Her vocals were featured on Bonnie Raitt's album Sweet Forgiveness, on songs "Gamblin' Man", "Runaway", "Sweet Forgiveness" and "Two Lives". She was also featured in Bruce Springsteen, Tom Petty, and Jackson Browne's "Stay " during Springsteen and The E Street Band's 1979 "No Nukes" shows at Madison Square Garden.

"Stay" is a doo-wop song written by Maurice Williams and first recorded in 1960 by Williams with his group the Zodiacs. Commercially successful versions were later also issued by the Hollies, the Four Seasons and Jackson Browne.