Ключевые слова: audio, audiobook, background, book, bookstore, communication, concept, copyspace, cover, device, earphone, education, entertainment, equipment, headphones, headset, information, knowledge, learning, leisure, library, listen, listening, listening to music, literature, media, music, musical, podcast, reading, record, school, sound, stereo, study, studying, teaching, technology, textbook, top, training, university,