 Many (but not all) non-album B-sides appear on the box set, many appearing on CD for the first time.The fourth CD includes a host of rarities, most notable being the "ABBA Undeleted" excerpt, which is a 23-minute medley of various songs that never saw the light of day either as a single or as an album track.It also contains some of the group's songs in different languages, as well as an alternate version of "Thank You for the Music", the song "Dream World" (dating back to the "Voulez-Vous" sessions) and the "Super Trouper" outtake, "Put On Your White Sombrero".