Isaac Hayes' deep bass took center stage on his simmering funk, but his Stax-honed production skill added extra heat. The Memphis Strings swoon as “A Man Will Be a Man” slowly unfolds, adding tension to Hayes' wounded performance; the crisp horns of “That Loving Feeling” help it bridge the gap between funk and disco. Hayes' big-picture view of how his songs come together still makes his brand of soul singular.