9 [ audio amplifiers, ] monitor speakers, audio mixers, [ echo machines, headphones, guitar amplifiers, keyboard amplifiers, microphones, graphic equalizers, sound effectors and sound controllers, ] sound generators, [ music sequencers, analog and digital recorders, blank audio and video magnetic discs, pre-recorded audio and video tapes, pre-recorded audio and video optical discs, pre-recorded audio and video magnetic discs, phonorecords, ] pre-recorded magnetic and optical tapes, cards, and discs containing musical tone data and song data for automatic play or auto accompaniment, [ optical discs containing sound wave data, and ] software programs for use in the control of electronic musical instruments; and parts for all of the above