Sammy Hagar and Grateful Dead's Bob Weir teamed up in Las Vegas, performing "Bad Motor Scooter" together.

Rockers Sammy Hagar and the Grateful Dead's Bob Weir collaborated during Hagar's "The Best of All Worlds" residency at Dolby Live in Las Vegas, performing the Montrose track "Bad Motor Scooter" for the first time in Hagar's residency. Hagar called it "my favorite show so far." Both residencies, including Weir's with Dead & Company, conclude on May 17.