Laura Burhenn is a restless talent, and her three albums as the singer and songwriter of The Mynabirds all have very different tones. Lovers Know, out in August, is Burhenn’s version of a glossy, synth-rock record. “Semantics,” the lead single, is essentially a mature, lucid appraisal of a difficult relationship set to a song that starts out rather tense, but builds to a cathartic peak.