Norah Jones covering the Dead earlier this summer

Bob Weir made a surprise appearance at San Francisco, CA’s Outside Lands festival on Saturday. The Grateful Dead guitarist—who has not performed at Outside Lands since Furthur headlined the festival in 2010—joined Norah Jones and her band for a cover of the Dead’s “It Must Have Been the Roses” near the end of their set. Though Jones’ band plays the Dead song regularly, this is the first time Weir has joined the group onstage.

Weir’s connection to band is Norah Jones guitarist Jason Roberts, who appeared at last week’s Move Me Brightly event at his TRI Studios. Roberts was one of several musicians more often associated with non-jamband music who joined Weir onstage during the Jerry Garcia tribute. According to an article in Rolling Stone, Weir’s daughter is a massive Norah Jones fan. Weir also sat in with God Street Wine at TRI on Thursday night.