A few examples of some useful LCC call numbers
M3 Composers complete works editions
M23 Piano sonatas
M312 Piano trios
M452 String quartets
M512 Piano quintets
M557 Woodwind quintets
M557.4 Brass quintets
M1001 Symphonies
M1002 Tone poems
M1003 Orchestral suites and variations
M1004 Overtures
M1500 Operas/Musicals—full scores
M1503 Operas/Musicals—vocal scores
M1507 Collections of opera/musical excerpts—vocal scores
M1520 Ballets
M1530 Secular cantatas/oratorios—full scores
M1533 Secular cantatas/oratorios—vocal scores
M1619 Art song collections
M1620 Art song collections by composer
M1621 Individual art songs
M1630.18 American popular song collections
M2000 Sacred oratorios—full scores
M2003 Sacred oratorios—vocal scores
M2010 Masses, including Requiems—full scores
M2020 Sacred cantatas—full scores
M2023 Sacred cantatas—vocal scores
M2072 Anthems
M2110 Sacred song collections
M2117 Hymn collections
