Listen to Saturday Night (Is the Loneliest Night of the Week) online. Saturday Night (Is the Loneliest Night of the Week) is an English language song and is sung by Frank Sinatra. Saturday Night (Is the Loneliest Night of the Week), from the album The Mega Collection, was released in the year 2015. The duration of the song is 1:51. Download English songs online from JioSaavn.