Last week, Umphrey’s McGee brought the prog-rock outfit OHM, a trio featuring former Megadeth guitarist Chris Poland, on the road for a run of shows through Washington D.C., Philadelphia, and Boston. On Tuesday, OHM performed at Chicago’s Martyrs’, and members of Umphrey’s McGee stopped by to root on their tour buddies. UMs Jake Cinninger and Joel Cummins then joined OHM for 90% of its second set, essentially an extended jam bookended by Willie Dixon’s ‘Spoonful. During the jam, Kris Myers also played drums for an improvisational segment. A week from today, Umphrey’s McGee will appear on Jimmy Kimmel Live with the aid of Huey Lewis.