Umphrey’s McGee keyboardist Joel Cummins sat in with Greensky Bluegrass during their performance at Chicago’s City Winery on Saturday. The gig was an after party for the Taste of Randolph festival that took place in the city earlier that day. Cummins made his appearance on a take on Norton Buffalo’s “Aint No Bread In the Breadbox,” which segued into the Greensky original “Don’t Lie.” Van Ghost guitarist and singer Michael Berg also joined the band for a cover of Dawes’ “When My Time Comes.”