| ↑ | 781 | music principles and forms |   → 016.781 |   |
| ↑ | 781.09 | history of music principles | | |
| ↑ | 781.0902 | music principles in Middle Ages | → 780.902 | |
| ↑ | 781.0903 | music principles in Modern Age | → 780.903 | |
| ↑ | 781.09031 | music principles in 16th century | → 780.9031 | |
| ↑ | 781.0904 | music principles in 20th century | → 780.904 781.170904 | |
| ↑ | 781.092 | music theoreticians | → 781.17092 | |
| ↑ | 781.0938 | music principles in ancient Greece | → 780.938 | |
| ↑ | 781.094 | music principles in Europe | | |
| ↑ | 781.1 | fundamental principles of music | | |
| ↑ | 781.11 | psychological principles of music | | |
| ↑ | 781.17 | artistic principles of music | | |
| ↑ | 781.1709 | history of artistic principles of music | → 781.2509 | |
| ↑ | 781.17092 | music art theoreticians | → 781.092 | |
| ↑ | 781.17094 | artistic principles of music in 20th century | → 781.0904 | |
| ↑ | 781.2 | music elements | | |
| ↑ | 781.22 | tempo | | |
| ↑ | 781.224 | rhythm | | |
| ↑ | 781.23 | music sound | | |
| ↑ | 781.24 | melody | | |
| ↑ | 781.25 | harmony | | |
| ↑ | 781.2509 | harmony in history | → 781.1709 | |
| ↑ | 781.26 | tonal systems | | |
| ↑ | 781.263 | Medieval ecclesiastical modes | | |
| ↑ | 781.28 | tessitura | | |
| ↑ | 781.286 | counterpoint | | |
| ↑ | 781.3 | composition | | |
| ↑ | 781.309 | history of composition | | |
| ↑ | 781.33 | seriality | | |
| ↑ | 781.4 | music techniques | | |
| ↑ | 781.42 | learning techniques, solfège | | |
| ↑ | 781.43 | execution techniques | | |
| ↑ | 781.4309 | history of execution techniques | | |
| ↑ | 781.45 | direction | | |
| ↑ | 781.46 | interpretation | | |
| ↑ | 781.4609 | history of interpretation | | |
| ↑ | 781.47 | accompaniment | | |
| ↑ | 781.49 | music recording | | |
| ↑ | 781.5 | music types | | |
| ↑ | 781.542 | music for movies | → 780.0791 | |
| ↑ | 781.556 | music for ballet | → 792.8 | |
| ↑ | 781.6 | musical traditions | | |
| ↑ | 781.62 | traditional folk music | | |
| ↑ | 781.62007 | ethnomusicology | | |
| ↑ | 781.625 | Italian traditional music | | |
| ↑ | 781.63 | light music, pop | | |
| ↑ | 781.64 | Western popular music | | |
| ↑ | 781.65 | jazz | | |
| ↑ | 781.66 | rock | | |
| ↑ | 781.7 | sacred music | → 782.22 | |
| ↑ | 781.71 | Christian sacred music | → 248 | |
| ↑ | 781.710092 | Christian musicians | → 780.92 | |
| ↑ | 781.72 | music of Christian liturgical year | | |
| ↑ | 781.8 | musical forms | | |
