Tom Waits and the San José State University Choraliers will both sit in with The Rolling Stones this evening. The performance will take place at Oakland, CA’s Oracle Arena.

The Stones revealed the sit in on their Facebook page earlier this evening. Every proper show on the 50 and Counting tour has featured at least one special guest.

Richards and Waits have collaborated a few times recently. The Stones guitarist appears on Waits’ 2011 album Bad as Me, and the two musicians recorded the song “Shenandoah” together for the sea chanty compilation Son of Rogue’s Gallery, which was released on Anti- earlier this year. Gwen Stefani and Keith Urban both performed with the Stones in Los Angeles on Friday night.