Listen to Saturday Night (Is the Lonliest Night of the Week) online. Saturday Night (Is the Lonliest Night of the Week) is an English language song and is sung by Oscar Peterson. Saturday Night (Is the Lonliest Night of the Week), from the album Oscar Peterson - The Classy Catalogue Recordings Series, was released in the year 2015. The duration of the song is 2:57. Download English songs online from JioSaavn.