Members of the Disco Biscuits and Seth Winters sat in with American Babies during their night performance at the Aura Music Festival on Saturday. Winters took the stage for Bob Dylan’s “Tangled Up In Blue” and the Tom Hamilton original “Old Fashioned” at the beginning of the set. Marc Brownstein, Jon “The Barber” Gutwillig and Aron Magner then came out at the end of the set for a cover of the Grateful Dead’s “Shakedown Street” that was followed by an extended jam.