More than 20 cities will get a taste of some classic prog-rock this summer as Styx and Yes co-headline the Progressive U.S. Tour, starting in July.

Exact details for the tour's July 4 opening show have not been revealed, but dates are booked through August 3 at Shoreline Amphitheatre in Mountain View, CA. The first announced show, at the moment, is set for July 5 at PNC Bank Arts Center in Holmdel, NJ.