Headliners grab headlines for a festival, but its often the strength of the undercard that makes a great musical experience on the ground. By their nature, undercards carry unfamiliar names. There's value in wandering festival grounds hither and thither drifting towards whatever catches your fancy. In fact, we recommend this approach. But The Rust Music was designed to give unheard artists an audience, so we took a magnifying glass to the undercard at Psychedelic Sleepover.