The pop-up secret show is a characteristically disappointing event– usually bands you only half care about show up and perform short sets in awkward spaces– but the Fader’s Vitamin Water Uncapped series has so far put together some impressive shows with appearances by The-Dream, Rick Ross and Zola Jesus in LA, 2 Chainz and Passion Pit in Seattle, and Best Coast and Kendrick Lamar in Portland (Wale’s show in Chicago is consciously being excluded from this list). The series brought out another solid bill in Austin on Tuesday with A-Trak, Little Dragon, and Big Boi, with Big Boi even going so far as to hop on stage with the Swedish pop band to perform a song they recorded together. Funky joint “Mama Told Me” is set to appear on Big Boi’s forthcoming Vicious Lies and Dangerous Rumors, which Big Boi notified the crowd will be out in November (unless it isn’t). No word yet on whether the track will be credited to Little Boi or Big Dragon. Watch below.