Subject Headings are standard terms that can be used to find resources on a given topic. The following can be used in either keyword or subject searches:
| M | Music (scores) |
| M45-49 | Solo viola |
| M224-228 | Viola with piano accompaniment |
| M1014 | Viola with orchestra, full scores |
| M1015 | Viola with orchestra, piano reductions |
| M1114 | Viola with string orchestra, full scores |
| M1115 | Viola with string orchestra, piano reductions |
| ML |
Music literature |
| ML128 .V36 | Bibliographies of viola music |
|
ML900-901 |
Viola history and criticism |
| MT | Instruction and study |
| MT280-285, 287 |
Technique, methods, and etudes |
| MT286 | Orchestral excerpts |