Ghost of a Saber Tooth Tiger played San Francisco’s Great American Music Hall last night and were joined by Bob Weir during the show. Sean Lennon, the son of Beatles frontman John, serves as the guitarist in the group.

The duo shared vocals on “I Know You Rider” and performed the tune with more of a psychedelic tinge.

The band, started by Lennon and Charlotte Kemp Muhl in 2008, is currently on tour and will perform at The Crocodile in Seattle alongside Syd Arthur.