Photo via facebook.com/warpaintwarpaint

Back in March, Warpaint played Union Transfer and Philadelphia-based singer/songwriter Kurt Vile joined the band on stage at a sold-out Union Transfer performance to perform”Baby” off of their 2010 album The Fool. It seems that this could be a forming tradition, as Vile has hit the stage with them again, though now the two have switched hometowns with LA-based Warpaint back in familiar territory. Pitchfork reports that Vile joined Emily Kokal in singing “Baby” at the Echoplex on Friday night for Red Bull Sound Select’s 30 Days in L.A. Watch their performance below.