MUSICAL INSTRUMENTS AND PARTS THEREOF-NAMELY, GUITARS, UKULELES, BANJOS, MANDOLINS; PICK-UP UNITS IN THE NATURE OF ELECTRONIC DEVICES WHICH PICK UP VIBRATIONS OR SOUNDS OF MUSICAL STRINGS FOR GUITARS, MANDOLINS AND OTHER STRING INSTRUMENTS; MICROPHONES DESIGNED FOR PICKING UP SOUNDS OF VOICE AND MUSIC; AMPLIFIERS IN THE NATURE OF ELECTRONIC EQUIPMENT WHICH AMPLIFY THE SOUNDS OR VIBRATIONS PICKED UP BY MICROPHONES OR PICK-UP UNITS; AND ELECTRICAL CORDS USED TO LEAD FROM MICROPHONES OR PICK-UP UNITS TO SAID AMPLIFIERS