Joe Moe comments

deadbeatles, Are Floyd a "jam band"? I know they used to improvise quite a bit back in the psychedelic days. But despite a few parallels, it doesn't seem like they could qualify as a jam band. Classic Rock, Prog Rock, Psychedelic Rock, etc; all of those labels apply. But I don't think they are a jam band. They are a different genre from Grateful Dead, Allman Bros., Phish, Widespread Panic, Umphrey's McGee, and many other lesser known acts. I bet the band themselves would insist on this distinction. Regardless of whether one likes jam bands or not, to be a jam band, a band must do 1) group improv (not just solos - although I know they did this a bit back in the day), 2) approach each performance differently, with completely different set lists, going 2 or 3 or more shows without repeating a song.