Leon Rosen w/Ernestine Black If you’re on the fence about sending your kid to grow up in an artist compound, then have a look at your future when San Francisco songwriter Leon Rosen sits behind the piano and plays a bluesy, smoky brand of pop-rock. Rosen’s band on this run includes players who’ve traveled the country with Macklemore and David Byrne (Carter Yasutake), Peel Dream Magazine (Jo-Anne Hyun) and even appeared on “American Idol” (Lee Jean Jr.).