You won't see Slash or Axl Rose on Glee anytime soon. Both of them were approached by the producers of Glee about an episode involving their hits. They decided not to be a part of the Golden Globe winning musical comedy series. Slash tells EW.com:

In the current climate of what's going on in entertainment these days, I try to be more optimistic than negative, because it's really easy to get negative about it, but I draw the line at Glee. 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."

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