The Crossroads Guitar Show took Chicago by storm this weekend -- and by storm, we mean that Bill Murray is hilarious. Yes, the actor turned on his legendary charm for a great cause, joining Eric Clapton to raise funds for The Crossroads Centre, an Antigua-based drug treatment facility founded by Clapton. The all-star lineup included Clapton, John Mayer, ZZ Top, Jeff Beck, BB King and many others, but it was Murray who stole the show. Taking the stage dressed as classic rock icons Jimi Hendrix, Elvis Presley and Buddy Holly, Murray worked the crowd and got everybody fired up for a great cause. Check out the video after the jump!