yeah, pink floyd sued roger waters for some reason several decades ago. I think it was for ownership of the catalogue, but I don't remember what he did to piss the rest of the band off. when all was said and done, he was only allowed to play songs from the wall. when I saw him a few years ago, he was not under that same restriction, so I don't know what's changed.
interesting fact, in the paper that talked about the concert, it said that he makes more with his tours than any other solo artist, and that includes paul mccartney, whom I've seen twice. here's an image of that concert:
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speaking of which, that appears to be time from dark side of the moon. another interesting fact, dark side of the moon is the album that's been on the billboard top 100 for longer than any other album in history. iirc, dark side of the moon came out in '73, and it was on there 'til '88 I think.