Jeff Tweedy played a set at Mountain Jam today that started with a string of newer songs and turned to a handful of classic Wilco tracks.

Tweedy was backed by a small band that featured his son Spencer on drums. They introduced a new tune, 'Slow Love,' by asking the audience to sing along to the simple, swirling song that sounded as if it was being sketched out onstage.

The few other new tunes – like "Nobody Dies" and "High as Hello," which Tweedy has played elsewhere on the current tour – had some scruffiness to them. Which makes sense, considering he's still prepping the debut album of his new band Tweedy, which is set to come out on Sept. 16.

After a string of new songs, Tweedy relieved the band and went into an acoustic set of some Wilco (and even earlier Uncle Tupelo) standards. "I'm going to reward you with some sloppily played versions of songs you've probably heard before," Tweedy joked.

He started with 'I Am Trying to Break Your Heart,' Uncle Tupelo's 'New Madrid' and a quiet version of 'Jesus, Etc.' – a song that, when Tweedy plays it alone, sounds downright fragile -- still as heartbreaking as it was when it came out 12 years ago.

Check out our Instagrams from Tweedy's set, including a short video of 'Jesus, Etc.':