Sound Cave was a 2011 performance by brekekekexkoaxkoax at the NMASS festival hosted by the Church of the Friendly Ghost in Austin, Texas. The cave was built by Josh Ronsen. The music heard in the video is what was heard inside the cave; the people outside the cave heard something else. Both musics were made by Josh Ronsen, except those outside the cave also heard acoustic bass by Brent Fariss, who was instructed to play in between any people rude enough to talk to the performance. Deena Odelle Hyatt moved people in and out of the Cave, and Bill Bridges provided invaluable all around assistance. Kirk Latkis helped with wood and transportation. The video was recovered from an audience member's camera, found abandoned the next day.