Ключевые слова: arrangements, audio, background, band, black, blue, clouds, concert, control, day, digital, dispositions, electric, entertainment, environment, equipment, event, festival, guitar, high, horizontal, instrument, loud speaker, loudspeaker, many, microphone, music, musical, night, nobody, outdoor, panel, party, performance, preparation, professional, radio, record, rock, scene, show, sky, sound, speaker, stage, stage background, studio, technology, transmission, voice,