Nate Ruess of Fun. has reunited his old band The Format.

Ruess and his bandmate Sam Means did a surprise acoustic set Monday night in Phoenix at a screening of their 2007 concert film Live at the Mayan — which is out now through Amazon Prime Video and vinyl through the band’s website. The duo then revealed they’ll do shows in New York March 20th and 21st, Chicago March 27th and 28th and Phoenix April 3rd.

The Format released two albums and a series of EPs before they split in 2008 when Ruess went on to start Fun.