Here's a little something about Pink Floyd from nme.com:
The former schoolchildren who sang the infamous chorus on PINK FLOYD’s 'ANOTHER BRICK IN THE WALL' have begun legal action for unpaid royalties. Peter Rowan, a royalties expert, has said that he is appealing on behalf of one former pupil and was working with others. The 23 north London schoolchildren recorded their vocals in secret and have since been unable to claim royalties as a result. According to BBC News, Rowan said: "They (the former schoolchildren) are owed their money and we lodged the first claim last week. I've been working on it for almost two years."
Wow. I'd hate to see what kind of royalties those kids who got ground up into hamburger meat will ask for.