English rock trio Alt-J brought out the big guns for their NPR Tiny Desk Concert. The big guns, in this case, are a string ensemble to back up the band's typically electronic sound. The band took the opportunity to play two songs from their upcoming album Relaxer, "3WW" and "In Cold Blood." They also played "Warm Foothills" from 2014's This Is All Yours and "Taro" from 2012's An Awesome Wave.
Watch the full performance above.