Most variety shows will only get "best of" sets because of this, I'd imagine.
Happy Days (and anything released by CBS DVD, in that they make it a nightmare, even when they don't have to....)
The Raccoons specials, as it's harder to clear the better-known artists (Leo Sayer, Rupert Holmes, Rita Coolidge, John Schneider, Dottie West) than it was for the series. This wouldn't be the first time the Raccoons had such trouble. On a soundtrack album, they had to replace all of John Schneider's vocals with other artists because he was under contract to another label.
Kidd Video, full stop. I guess it would be POSSIBLE, as they'd just have to dub over the mainstream songs, and the music video segments weren't necessary to the plot. But diehard fans would hate it.