Last week, Kurt Vile joined the War on Drugs at a Philadelphia concert to perform "Under the Pressure", "Arms Like Boulders", and "I Hear You Calling". You can watch videos of the performance below, via The Key. (Look closely—that's Vile to the right, sitting down in the shadows.)

Vile used to be a member of the War on Drugs, leaving the band after 2008's Wagonwheel Blues.

"Under the Pressure":

"Arms Like Boulders":

"I Hear You Calling":

Watch the War on Drugs play "Red Eyes" at Primavera Sound 2014:

Watch Vile perform on Pitchfork.tv's "Don't Look Down":