Broken Bells | Photo by Joe Del Tufo | joedeltufo.com

After a set at this weekend’s Firefly Music Festival, Broken Bells – the collaboration of The Shins’ James Mercer and DJ / producer Danger Mouse – announced they are returning to Philadelphia this fall, headlining the Electric Factory on September 27th. Tickets for the all ages show go on sale this Friday, June 27th, at 10 a.m. Watch their Live on Letterman performance below.