Ключевые слова: audience, audio, auditorium, background, black, blur, broadcast, business, center, classroom, communication, concept, concert, conference, convention, education, empty, equipment, event, guest, hall, keynote, lecture, light, live, meeting, mic, microphone, modern, music, people, podium, presentation, professional, public, room, seminar, show, sing, sound, speak, speaker, speech, stage, stand, talk, teacher, university, voice, workshop,