Bruno's location, near the quick-beating heart of the Mission District, might be partially responsible for the distinct mix of players that crosses the club's stage. There's a little bit of everything -- from slickly dressed scenesters and burned-out hepcats to boho music students and tenor-wielding street poets. Though the club has recently undergone a booking facelift, now presenting mostly fusion-minded groove bands, the open Monday night session has become one of the most compelling jazz jams in the city. Starting at 10:30 p.m., the free-for-all draws a crowd of talent both young and old. Musicians of all skill levels and all instruments are welcome to jump onstage for a song or two, and even though top-drawer players can dominate, those with less experience won't get left out in the cold. The assortment of styles is what makes the night great, and -- like the bustling sidewalks outside the club -- it's a different scene every time.