One Night Only features the group's concert at the MGM Grand in Las Vegas in 1997. The Bee Gees performed songs from every decade from the 1960s to the 1990s. They also sang a tribute song to their late brother Andy Gibb, '(Our Love) Don't Throw It All Away'. During this song old footage of Andy is shown, including him singing the second verse of the song. The vocals from the original recording also play during that section. Céline Dion guest-starred on the Bee Gees-penned 'Immortality'. Recorded vocals by Frankie Valli are featured during 'Grease', and are also taken from the original song.