The Teleharmonium foreshadowed Muzak and Cable TV Music only channels, in that it was meant to be listened by subscribers over telephone wires.
Wow! "Music on hold" in 1906. That's thinking outside of the box. At that time, I'd bet most people thought it was witchcraft. At that time, if most people wanted new music, they went out and bought sheet music so they, or someone else, could play it themselves.
Indeed, they tried all kinds of tricks to make it popular including a sort of 5.1 surround by hiding spkrs all around the room, making it available in your hotel room and literally piping it under the streets.
Elisha Gray's musical telegraph from 1876 came before the Telharmononium.
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Perhaps not as impressive but much more portable. Gray's oscillators were built from steel reeds excited by electromagnets.