Known for previous instrumental releases, post-rock-favoring Imitation Electric Piano undergoes a number of changes on their second LP: an expanded and shuffled lineup (including more overlap with Stereolab), the addition of singer Mary Hampton, and a stronger bent toward folk and acoustic guitars. Unfortunately, the vocals don’t always work. Hampton’s voice can be sweet, but often feels too airy and insubstantial. On the Simon and Garfunkel-sounding “For the Best,” the chorus is particularly lacking. On “Come Into Force,” the male and female vocals take a backseat to the electric guitar, and the track works better as a result.