Please join me in congratulating our friend and colleague Duff McKagan, who’s headed into the Rock N’ Roll with Guns N’ Roses, the band he co-founded with Slash, Axl Rose, and co. in Los Angels in the 1980s. They’ll be joined in the Rock Hall class of 2011 by the Beastie Boys and the Red Hot Chili Peppers, among others. The induction ceremony goes down in April.Obviously, Axl Rose still tours as Guns N’ Roses — he’s the only member of the classic lineup in the band — and he’s bringing the crew to KeyArena on Dec. 16. If you act now, you can still get half-price tickets on Groupon. (If you need a primer on the GNR backstory, we highly suggest you pick up a copy of Duff’s new book, It’s So Easy.)Congrats, Duff!