Tim McGraw previewed music from his upcoming album during his Wednesday night (March 4) performance at the Country Radio Seminar’s annual Music City Jam, but he indicated he has no idea when Curb Records will release it. Throughout the evening, McGraw and the Warren Brothers, who hosted the show, made several verbal jabs at the label for continuing to release singles from McGraw’s Let It Go album that was released in March 2007. Last year, McGraw apologized to fans for Curb’s decision to release a third greatest hits album instead of the project he finished recording more than a year ago. Backed by his band, the Dancehall Doctors, McGraw offered an extended set following other performances by Lance Miller, Halfway to Hazzard and McGraw’s cousin, Catherine Raney. Faith Hill, McGraw’s wife, made a brief appearance to introduce Randy Owen, who performed Alabama’s “Tennessee River” and “Mountain Music.” View photos from the show.