| M45–M49 | Viola alone: |
| M45 | Collections (more than one composer) |
| M46 | Original works: Collections (one composer) |
| M47 | Original works: Separate |
| M48 | Arrangements: Collections (one composer) |
| M49 | Arrangements: Separate works |
| M224–M228 | Viola with piano accompaniment: |
| M224 | Collections (more than one composer) |
| M225 | Original works: Collections (one composer) |
| M226 | Original works: Separate |
| M227 | Arrangements: Collections (one composer) |
| M228 | Arrangements: Separate works |
| M286–M287 | Duets for two stringed instruments (of all kinds): |
| M286 | Collections |
| M287 | Separate works |
| M290–M291 | Duets—one stringed and one wind instrument |
| M294–M295 | Duets—one stringed and one plucked instrument |
| M310–M314 | Piano and two stringed instruments |
| M320–M324 | Piano, one stringed, and one wind instrument |
| M330–M334 | Piano, one stringed, and one plucked instrument |
| M349–M353 | Three stringed instruments |
| M360–M364 | Three stringed and wind instruments |
| M370–M374 | Three stringed and plucked instruments |
| M450 | Quartets—Collections (more than one composer and medium) |
| M451 | Quartets—Collections (more than one composer) |
| M452 | Quartets—two violins, viola, violoncello |
| M452.2 | Quartets—four violins |
| M452.4 | Quartets—other combinations of stringed instruments |
Concertos and similar pieces
| M1014 | Viola with orchestra, full scores |
| M1014.5 | Cadenzas for such works |
| M1015 | Viola with orchestra, piano reductions |
| M1114 | Viola with string orchestra, full scores |
| M1114.5 | Cadenzas for such works |
| M1115 | Viola with string orchestra, piano reductions |
Studies and methods
| MT280 | General works |
| MT282 | Systems and methods |
| MT285 | Studies and exercises: General works |
| MT286 | Orchestral studies (excerpts) |
| MT287 | Bowing |
| MT288 | Positions |
| MT289 | Chords |
| MT290 | Harmonics |
| MT291 | Other techniques |
| MT292 | Two violas |
| MT294 | Teaching pieces |
| MT295 | Instructive editions: Two or more composers |
| MT297 | Instructive editions: One composer |
| MT298 | Self-instructors |
Classification Numbers for Books about the Viola
| ML128 .V36 | Viola bibliographies |
| ML900 | General works |
| ML901 | Construction |
| ML905 | Music and playing |
