Run by label owner/musician Sam Melancon, Debacle is a bold experimental-music fest that keeps growing and improving. Now in its sixth year, Debacle hosts three days of subterranean sonic thrills in three venues. Tonight’s lineup taps questing national (Expo ’70, Monopoly Child Star Searchers, Plankton Wat, Total Life, LA Lungs) and local (Brain Fruit, Panabrite, Secret Colors) acts whose styles encompass zoned drones, ragged ragas, fourth world exotica, ambrosial ambience, and other outlier expressions. (FRED Wildlife Refuge, 127 Boylston Ave E,, 8 pm, $15 adv/$20 DOS, 21+)