Guns N' Roses has become the latest act to turn down Glee. The band's former guitarist Slash has revealed he and frontman Axl Rose were approached by Glee's producers about a possible episode themed around their hits -- but opted not to be a part of the series. Slash tells, "Glee is worse than Grease and Grease is bad enough. ... When Grease came out, I was like, 'Oh c'mon, give me a break.' Actually, I look at Grease now and think, 'Between High School Musical and Glee, Grease was a brilliant work of art.'"