Grace Potter & the Nocturnals are like a modern-day version of Tina Turner stroking the microphone in a spangled mini-dress while fronting the Rolling Stones circa Sticky Fingers. The proof is there for all to hear on the bands third album for Hollywood Records, hitting this spring, and marks an artistic breakthrough for a vital young band caught in the act of fulfilling its immense promise. Little wonder that Grace and her cohorts have chosen to title it, directly and emphatically, Grace Potter & the Nocturnals.