Apparatus and instruments for processing, reproducing, transmitting and recording sound or images; radio-broadcasting receivers; video monitors; microphones; loudspeakers; woofers; sub-woofers; headphones, earphones; mini audio systems; audio/video amplifiers; recording players; recorders/players of optical discs; compact disc players/recorders; mini disc players/recorders; laser disc players; digital video (versatile) disc players; recorders/players of magnetic tapes; stereo cassette decks; hard disc recorders; video cameras; video projectors; video screens; audio mixers; audio signal processors; audio/video receivers; graphic equalizers; electronic sound effectors; amplifiers for musical instruments; effectors for musical instruments; samplers; electronic tone generators; electronic circuits for tone generators; recorders and players of MIDI data; electronic music sequencers; MIDI interfaces; rhythm programmers; rhythm machines; karaoke machines; computer software; routers; electronic integrated circuits; large scale integration chips; semi-conductor devices; hardware, software and programs for computer games; hardware and software for video games; electronic publications (downloadable); electronic publications in the field of music; metronomes; parts for all the aforesaid goods