telharmonium
Tel`har*mo"ni*um, n. [Gr. th e far + harmolium.] Defn: 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.