Abstract: A musical instrument which comprises (i) a portable transmitter unit, (ii) a receiver unit, and (iii) a standard or modified piano, electronic organ, or other keyboard musical device. The transmitter unit has sixty keys, each of which corresponds to a key of the remote piano, organ, or other keyboard musical device, and also has eight auxiliary switches for controlling the receiver and auxiliary functions of the musical device to be remotely played. The transmitter includes electronic circuitry which scans the keys and auxiliary switches, and transmits an FM signal modulated by a serial digital pulse train identifying the transmitter keys which are depressed and the auxiliary switches which have been actuated. The receiver unit decodes the transmitted pulse train, eliminates erroneous data, and generates output signals to control the corresponding keys and auxiliary functions.