| X |
Music |
| Xa |
Music : theory |
| Xb |
Music : history |
| Xd |
Music for keyboard instruments |
| Xe |
Music for stringed instruments |
| Xf |
Music for wind instruments |
| Xg |
Music for plectral instruments |
| Xh |
Music for drums and percussion instruments |
| Xi |
Electronic instruments |
| Xk |
Instrumental ensembles |
| Xl |
Orchestras |
| Xm |
Instrumental music : other |
| Xo |
Solo voice |
| Xp |
Choirs |
| Xq |
Vocal music : other |
| Xqh |
Songs |
| Xqhz |
Popular songs and chants |
| Xqj |
Children's songs |
| Xr |
Dramatic vocal music |
| Xs |
Sacred music. Liturgy and ritual |
| Xu |
Western traditional music |
| Xv |
Non-western traditional music |
| Xx |
Jazz, rock, and other popular music |
| Xy |
Lyrics to vocal and dramatic music. Librettos |
