Ключевые слова: adult, background, basic, black, blackboard, board, caucasian, chalk, chalkboard, class, classroom, college, concept, education, elder, hear, knowledge, learn, lecture, lesson, listen, man, melody, music, musical, notes, old, people, person, play, professional, rock, school, sound, student, study, studying, subject, teach, teacher, text, university, white, word, write,