Triangle Park Shows

Anybody know any information pertaining to the seemingly guerilla music shows happening at Triangle Park, the small cornerspace of land with the fountain at Sunset , Edgecliffe and Grifftih Park Blvd? I caught a new metal band ripping out old school The Number of the Beast era guitar riffs tonite; just four songs for about 15-20 minutes tops, but it was pretty damn rad to just walk down your street to a free outdoor show with some new band trying out their live performance skills. Several weeks ago it was an emo-indie (at least my guess from the listening vantage from my bedroom window) band whose melodies echoed close by. Whoever is putting these shows, I salute you!