The original double-LP version of this compilation was one of the most generous in the Bee Gees' catalog, assembling 20 of their biggest disco-era hits and most important album tracks in one place, all while the disco boom was still alive in a lot of places. The expanded Reprise double-CD edition of this collection, released in September of 2007, boosts the original compilation's running time by more than 30 minutes, most of the latter made up of remixes and alternate mixes of established hits, such as a 12" promo version and a Teddybears remix of "Stayin' Alive," a Jason Bentley/Philip Steir remix of "You Should Be Dancing," a Count De Money remix of "If I Can't Have You," a Future Funk Squad remix of "Night Fever," and a Supreme Beings of Leisure remix of "How Deep Is Your Love." There's also one previously unissued track, "Warm Ride," without a word of mention about when or where it came from -- in its defense, it's as good a song as anything the Bee Gees actually released in the second half of the '70s. Its presence is a reminder of just how high the quality of their work was during this period, that they had material of such quality that they hadn't utilized, and that they could put it onto a compilation such as this without breaking up the concept or quality. The other selling point on this double-CD set is the sound quality, which runs circles around the prior CD version as well as the vinyl original, rivals the best-sounding audiophile versions of the trio's work, and more than matches the quality on the expanded reissues of their first three albums.