The criteria I've used to select the songs, by the way, is that Rick was the dominant or only vocalist on at least part of the song. I've left out songs like Echoes or the chorus of Us and Them because it seems that Rick and Dave's voices are equal in volume, so it's harder to hear what Rick is doing. I've also left out Rick's versions of Comfortably Numb and Arnold Layne, because they weren't performed by Floyd but rather as part of Dave's solo band.