Elton John Tells Kings of Leon: 'Lighten Up, You A**holes'Elton John is the latest in a list of celebrities joining in on the 'Glee' debate.

The legendary musician appeared on Jimmy Fallon's show last night to discuss, among other things, some artists' strong feelings about keeping their music off the show.

John, whose song 'Don't Go Breaking My Heart' was featured on the FOX hit's second season, called out Kings of Leon for refusing to let 'Glee' creator Ryan Murphy use their song 'Use Somebody' on the show.

"There's a big debate going on about the 'Glee' thing at the moment," said John. "A lot of bands say they don't want their stuff on 'Glee.' It's like, 'Lighten up, you a**holes.'"