What? Good soul music on a Tuesday night in Dallas? It's true: Those in need of a mellow shot of rhythm and blues should check out Amy Lacour tonight at Opening Bell's Mosaic location. LaCour, an L.A.-based singer-songwriter born and raised in Seattle, is working on her full-length debut, but already has the impressive Bitter Suite EP on her resume. Songs such as "One Man's Stone," "Fall" and "Fool's Road" feature LaCour's gospel-tinged voice cast against music that resonates will hip influences