My Morning Jacket will perform during The Late Show with David Letterman on October 12. In addition, MMJ will play a set at Ed Sullivan Theatre, where Letterman is recorded, later in the day as part of the Live On Letterman webcast series. The Live on Letterman concert event will be webcast live on Tuesday, October 12 at 8 PM EST / 5PM PT at CBS.com. Fans can sign up to win tickets here.