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From: Webster's Revised Unabridged Dictionary (1913)

 Tel·har·mo·ni·um n.  An instrument for producing music (Tel·har·mo·ny [ ]), at a distant point or points by means of alternating currents of electricity controlled by an operator who plays on a keyboard. The music is produced by a receiving instrument similar or analogous to the telephone, but not held to the ear. The pitch corresponds with frequency of alternation of current.