There only happen to be two early-week Soundboard writeups this time around (you can read about those shows after the jump), but there’s still plenty of great live music to check out, especially this evening. Millennium Park’s Downtown Sound series continues tonight with a free show by Jonathan Richman, opened by Chicago’s greatest Hammond B-3 combo, the Deep Blue Organ Trio. Over at Schubas, Toronto’s Zeus—also known as the backing band of singer-songwriter Jason Collett—holds court.