AVANTGARDEN Come visit this converted turn-of-the-20th-century house in Montrose on Monday nights starting at 7pm for "They, Who Sound," a weekly showcase where local and visiting musicians perform experimental sounds, noise, improvisational music, and pretty much whatever else they feel like. Nick Cooper's jazz ensemble, Free Radicals, are back every Monday at 10pm after a brief hiatus; the Radicals' 2012 album The Freedom Fence won the Houston Press Music Award for Local Album of the Year.