| 84 / | HD | MUSIC |
| 1 | DF | INSTRUMENTS {9} |
| 600 | DF | .~ Electrical musical tone generation {5} |
| 601 | DF | .~.~ Data storage {6} |
| 602 | DF | .~.~.~ Digital memory circuit (e.g., RAM, ROM, etc.) {9} |
| 634 | | .~.~.~.~ Accompaniment {3} |
| 635 | DF | .~.~.~.~.~> Rhythm {1} |
| 637 | DF | .~.~.~.~.~> Chords |
| 638 | DF | .~.~.~.~.~> Arpeggio |