John Frazier and Sam Bush will perform with Yonder Mountain String Band during their slot at Bonnaroo this year. The band, who plays on the final day of the festival on the Main Stage, recently announced that longtime mandolinist Jeff Austin was departing to focus on his solo career.

Yonder is currently in the process of rolling out special guests for the remainder of their shows, including Ronnie McCoury, John Bell and Jason Carter at this year’s Kinfolk Celebration.