Alt-J Premiere Three New Songs, Perform on Letterman

The This Is All Yours hype train continues.

Alt-J'sThis Is All Yours isn't officially out until September 23rd, but the band are performing new songs all over the place - they took to Letterman to perform the radio-friendly single "Left Hand Free," then treated concertgoers at an NPR First Listen Live event to three previously unheard tracks from the record, "Bloodflood Pt. 2," "The Gospel of John Hurt," and "Nara." You can check out video of all four performances below - we're particularly psyched about weird-sexy, percussion-heavy slow-burner "Bloodflood Pt. 2."

"Left Hand Free" on Letterman:

"Bloodflood Pt. 2":

"The Gospel of John Hurt":