The String Cheese Incident will play a special set at Gathering of the Vibes this year as the group will welcome guests Peter Rowan and David Grisman & Friends for a set of Grateful Dead and Old in the Way material.

Even more, the band is calling on the fans to vote on material for the group to debut during their collaborative set. Among the choices are Grateful Dead staples like “Bertha,” “I Know You Rider,” “Ripple,” “Sugaree,” “Terrapin Station” and many more.

Voting is now open and will close April 9. Everyone can vote for one song per day until that date.

UPDATE: Gathering of the Vibes now say that SCI will team up with Grisman and Rowan for two sets instead of one.