Watch: alt-J x 2017 Tiny Desk Concert for NPR.

In support of their upcoming new album, 'Relaxer', alt-J returned to the NPR Music office to perform a new Tiny Desk Concert live session - this time with the help of a cellist and two violinists, who performed newly written string parts composed by the band’s friend Will Gardner.

Set List:
3WW
In Cold Blood
Warm Foothills
Taro

Watch the Tiny Desk Concert below...