Call it rock, call it soul, call it gypsy-jazz, but the only genre we can all agree on when it comes to Jessica Hernandez and The Deltas is "unclassifiable." The charismatic leading lady and her jazz-trained band hail from Detroit, where they have soaked up the influences of the gritty streets and added a little bit of Wanda Jackson and Dolly Parton. The band of six has just as flirty yet tenacious a stage presence as its recordings imply, balancing onstage banter with growling chords and hip-shaking melodies. Their R&B foundation makes for a sultry backdrop to bouncing cabaret rock and funky blues, a rich sound with a dark side. They're touring in honor of their upcoming debut full-length, Secret Evil, out Aug. 19, so you'll definitely hear their single "Tired Oak" along with the rest of their dance-floor–packing tunes.