A serial number, opus number, or thematic index number assigned to a musical work or expression by the composer, arranger, publisher, or a musicologist. May be used to differentiate a musical work or expression from another with the same title.
| 383 | 0#$ano. 17$bop. 31, no. 2 | ||||||||
| 383 | 1#$cS. 375$dSearle$2mlati | ||||||||
| 383 | 0#$ano. 9 | ||||||||
| 383 | 0#$ano. 10 | ||||||||
| 383 | 0#$bop. 244 | ||||||||
| 383 | 0#$bop. 8, no. 1-4 | ||||||||
| 383 | 0#$cRV 269$cRV 315$cRV 293$cRV 297 | ||||||||
| 383 | 0#$cF. I, 22-25 | ||||||||
| 383 | 1#$bop. 2$ePleyel | ||||||||
| 383 | 1#$cG. 154$dGérard $2mlati | ||||||||
| 383 | 0#$bop. 8, no. 1-4 | ||||||||
| 383 | 0#$cRV 269$cRV 315$cRV 293$cRV 297$dRyom$2mlati | ||||||||
| 383 | 0#$cF. I, 22-25$dFanna$2mlati | ||||||||
| 383 | 0#$bop. 3$eAndré | ||||||||
| 383 | 0#$bop. 5$eHummel | ||||||||