Other forms: harmonists
A harmonist is someone who's very good at blending different voices or instruments into music that sounds pleasant. To be a successful composer, you have to be a great harmonist.
Harmonists are skilled at harmonies, creating music from separate strands that go well together. Another kind of harmonist does a similar thing with literature or religious texts, interpreting different passages in a way that melds their meanings or finds agreement between them. Historically, Christian harmonists also brought harmony to the Bible by trying to arrange its parts in chronological order. The Greek root of harmonist is harmonia, "concord of sound."