Apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, namely, blank magnetic discs; recording discs, namely, pre-recorded music discs; data processing equipment and computers, namely, data processors; compact discs containing pre-recorded sound and video featuring music; accessories for musical instruments, namely, audio mixers, laser turntable, namely, record player; synthesizer, horns for loudspeakers, audio speakers, microphones, electronic music sequencers, electronic sound effectors, namely, sound recording apparatus; electronic tone generators, namely, electronic sound processing apparatus; needles for record players, sound recording apparatus, sound reproduction apparatus, sound transmitting apparatus, speed regulators for record players, tone arms for record players, vacuum tubes, namely, vacuum tubes for radios; amplifier for musical instruments, acoustic couplers, earphones; pre-recorded optical discs containing software and computer software programming for use in audio mixing to mix sounds so as to fulfill the function of a DJ operation system