He's got that Ron Sexsmith-Neil Finn-Jeff Buckley melancholy singer-songwriter thing going for him. He's got a great band, featuring hypercerebral drummer Paul "Falcon" Valdez and dreamlike pedal steel player Matt Rhodes. His CD was perched at or near the top of the sales chart at Cactus Music & Video all summer long. And while Castillo may not be tall, he is dark and handsome. (In fact, he looks a lot like Townes Van Zandt did before the vodka took its toll.) So why is this guy unsigned? Beats us. Meanwhile, you should catch him out anywhere from cozy pubs like the Stag's Head to roomy showcase venues like the Meridian. We think bigger rooms are in his future soon.