Electronic audio equipment, namely, headphones for disc jockeys, headphones, sound mixers for disc jockeys, sound mixers, record players being turntables, compact disc players, and mp3 players for use in booths for disc jockeys; telecommunication transmitters and structural parts and accessories for telecommunication transmitters; dials of telecommunication transmitters; dials of controllers for disc jockeys, namely, dials of controllers that allow disc jockeys to perform DJ play by setting playback positions including forwarding and rewinding music and by controlling playback speed of the music; communications computers; digital audio players for disc jockeys; combination monitor and player for disc jockeys; sound mixers for disc jockeys; remote controls for disc jockeys; remote controls for use with telecommunication machines and apparatus; apparatus and instruments for recording, transmitting, reproducing, or processing sound, images, or data; downloadable application software which disc jockeys can play, namely, application software for analyzing music for DJ play including analyzing beat position, beat per minute and phrase, application software for setting DJ performance in advance including setting cues and loop reproductions, and application software for DJ to perform DJ play; downloadable computer programs for music data management; downloadable computer programs and computer software for producing downloadable music and sounds; audio interfaces; personal digital assistants