Ключевые слова: acoustic, art, bass clef, black, black and white, classical, classics, concert, ensemble, entertainment, exercise, fracture, group, hobby, key, learn, line, lines, lyrics, melody, music, musical instruments, musician, notes, old, orchestra, page, piano, practice, school, solo, song, sound, speed, study, textbook, tone, torn, treble clef, white, writing book,