Mellow chanteuse Maye Cavallaro and dexterous guitarist Mimi Fox are evenly matched on their consistently superb Hearts (Redhead). Cavallaro’s easy elegance and burnished vocal beauty, luxurious as purple velvet, suggest a more robust Diana Krall. Fox, alternating among three acoustic guitars, two electrics and one nylon-string, echoes the magnificence of Les Paul. Like Paul, she knows how to blend seamlessly with a singer. She is the cool yin to Cavallaro’s warm yang-two dynamic halves of a greater whole. Listening to their downy “Daydream,” percolated “I’m Beginning to See the Light,” boldly expansive rendering of Paul Simon’s “Under African Skies” and sensual, Latin-accented interpretation of Jesse Neal Barish’s tender title track is to experience teamwork at its most magical.