Electric sound equipment, namely, apparatus and instruments for recording, transmission, reception, processing, retrieval, reproduction and manipulation of sound and/or audio signals and effects; active direct input boxes; dynamic digital and analog signal processors; keyboard amplifiers; converters, electric signal converters; crossovers; graphic and parametric equalizers; microphones; microphone preamplifiers; modeling amplifiers; audio mixing consoles; master audio mixing desks for use in an audio recording studio; electronic musical recording apparatus; apparatus for recording sound on digital and magnetic discs and/or tapes; compact discs containing sound libraries and software programs for creating digital audio files in the field of music production; pre-recorded recording media for audio signals, namely, CDs, CD-ROMs, DVD-ROMs and hard disks featuring sound libraries and sound loops; DJ apparatus, namely, turntables, compact disc players and mp3 players; signal distribution devices, namely, patchbays and digital clock distribution devices; control apparatus for audio signals, namely, control surface hardware; audio data processors, namely, surround processors; headphones; audio speakers; headphone amplifiers; loudspeakers and loudspeaker systems; studio audio monitors; electric lighting apparatus, namely, lighting controllers consisting of the following either individually or as a component of such controllers dimmer switches, on/off switches, sequencers and timers, and dimmer packs; computer programs for educational use for teaching music and instructional manuals sold as a unit therewith; and electronic publications recorded on computer media and downloadable electronic publications in the nature of manuals, brochures, specification sheets and magazines in the field of music