J Mascis is playing with the Roots on Late Night with Jimmy Fallon tonight, so tune in to check him out!
UPDATE: The full episode of Late Night with Jimmy Fallon featuring J's appearance with the Roots is available to stream below. For those who just want to see J's part of the show: scroll to 6:18 to watch Fallon introduce J. Then scroll to 17:00 - 17:50 to see J play a bit of the Cure's "Just Like Heaven" and Fallon asks J about his guitar (Fallon's hinting worked! J gave Fallon a guitar after the show). At 29:38 - 29:55 J & the Roots play "Feel the Pain."
For more J Mascis awesomeness, stream his cover of Mazzy Star's "Fade Into You" below, plus watch Dinosaur Jr's set captured at Glastonbury 2013.
While you're at it, check out J's solo performance captured last October at Kennedy Center