A person or device that harmonizes; something that creates harmony or brings things into agreement.
From harmonize + -er suffix (one who performs the action). The -er suffix forms agent nouns, indicating a person or tool that performs the action of the root verb.
Modern harmonizers are audio devices that use digital processing to generate perfect harmonies from a single vocal line—they're literally machines that can analyze a melody and create the exact harmony you need in real-time. It's technology that would have amazed musicians fifty years ago.
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