Trivial Tuesday

Back in the late 80's ('87 or so), a group had their first, and biggest, hit with a song called "Heart and Soul." This band took its name from a minor Star Trek character from the original series first season episode, Amok Time (later parodied in many places, including the Futurama episode "Why Must I Be a Crustacean in Love?"). Name the musical group or the character. It's your choice, since the answer is the same either way.