Jeff Tweedy's new band is a family affair, and the Wilco frontman — accompanied on drums by his 18 year-old son Spencer — played two new songs last night on 'The Tonight Show Starring Jimmy Fallon.'

The band, aptly named Tweedy, performed 'High as Hello' (which you can watch above) and 'Summer Noon' (see it below) — both from their upcoming debut, 'Sukierae.'

Although the album doesn't drop until Sept. 23, Tweedy hasn't been shy about sharing the new music: We've also already heard 'I'll Sing It,' 'Fake Fur Coat,' 'Diamond Light' and 'Wait for Love.'

And here's Lucius' Jess Wolfe and Holly Laessig-- who appear in the 'High as Hello' clip -- talking about working with Tweedy in an exclusive interview: