Listen to Once in a While online. Once in a While is an English language song and is sung by Barry Bostwick. Once in a While, from the album Absolute Treasures: The Rocky Horror Picture Show - The Complete and Definitive Soundtrack (2015 40th Anniversary Re-Mastered Edition), was released in the year 2015. The duration of the song is 3:03. Download English songs online from JioSaavn.