Music Cataloging at Yale Call numbers

Choral music encompasses secular and sacred choruses and cantatas, with or without solo voices, with or without accompaniment. For information about subject headings for these works, see Choruses vs. cantatas

Operas		Oratorios
M1500 M1501 M1502 M1503 M1503.5 M1504 M1505 M1506 M1507 M1508 M1508.1 M1508.2 M1509	Complete works Concert arrangements Vocal and chorus scores without accompaniment Vocal and chorus scores with accompaniment   Concert arrangements College operas Excerpts   Original accompaniment   Arranged accompaniment     Orchestra or other ensemble     Piano or organ       Collections       Separate works. By title   Vocal and chorus scores without accompaniment     Collections     Separate works Operatic scenes (independent works)	Secular	Sacred
		M1530 M1532 M1533 M1534 M1535 M1536 M1537	M2000 M2002 M2003 M2004 M2005 M2006 M2007	Full scores Vocal and chorus scores without accompaniment Vocal and chorus scores with accompaniment Excerpts   Original accompaniment   Arranged accompaniment     Orchestra or other ensemble     Piano or organ       Collections       Separate works
Incidental music		Masses (See also Parts of the Mass) Use for cyclical choral works set to liturgical or other texts, whether or not for use in a church
M1510 M1512 M1513 M1515 M1516 M1517 M1518	Full scores Vocal and chorus scores without accompaniment Vocal and chorus scores with accompaniment Excerpts   Original accompaniment   Arranged accompaniment     Orchestra or other ensemble     Piano or organ       Collections       Separate works. By title		M2010 M2011 M2013 M2013.5 M2014 M2014.5 M2014.6	Settings of the Ordinary and Requiems   Complete works     Accompaniment of orchestra or other ensemble     Vocal and chorus scores without accompaniment and unaccompanied     Accompaniment of organ, piano, or other instrument; vocal scores     Unison voices   Excerpts Settings of Propers Offices and other services
Ballets		see Class M, music and books on music, M2015-M2017.6 for Anglican, Jewish, etc. services use M2020-M2102.5 for individual parts of liturgical (e.g., Credo) or nonliturgical services set as separate compositions
M1520 M1522 M1523 M1524 M1525 M1525	Full scores Vocal and chorus scores without accompaniment Piano scores. Vocal scores with piano Excerpts   Original accompaniment   Arranged accompaniment     Orchestra or other ensemble     Piano

Choruses For sacred choral music, follow the instructions preceding M2060 in Class M, music and books on music: Class works in the following priority unless otherwise noted: 1) by type or absence of accompaniment, 2) by text, 3) by season or occasion, 4) by type of chorus
Accompaniment of 2 or more instruments
		Mixed voices
Secular	Sacred	Full scores
M1530 M1530.3 M1531	M2020 M2020.3 M2021	Orchestral accompaniment   General   With recitation Other accompaniment (string orchestra, band, other ensemble of 2 or more instrument, electronic acc.)
Secular	Sacred	Vocal scores
M1532 M1533 M1533.3	M2022 M2023 M2023.3	Vocal and chorus scores without accompaniment Vocal scores with piano (or organ for sacred choruses) accompaniment   General   With recitation
Secular	Sacred	Excerpts
M1534 M1535 M1536 M1537 M1537.5	M2025 M2026 M2027 M2028 ---	Original accompaniment Arranged accompaniment   Orchestra or other ensemble   Piano     Collections     Separate works   Vocal and chorus scores without accompaniment
		Men's voices
Secular	Sacred	Full scores
M1538 M1538.3 M1539 M1539.3	M2029 M2029 --- M2029	Orchestral accompaniment   General   With recitation Other accompaniment (string orchestra, band, other ensemble of 2 or more instrument, electronic acc.)   General   With recitation
Secular	Sacred	Vocal scores
M1540.5 M1540 M1540.3 M1540.5	M2029.5 M2030 --- --- M2029.5	Vocal and choruses without accompaniment Vocal scores with piano (or organ for sacred choruses) accompaniment   General   With recitation Vocal and chorus scores without accompaniment
Secular	Sacred	Excerpts
M1541 M1542 M1542.5	M2031 M2032 ---	Orchestral accompaniment Piano (or organ for sacred choruses) accompaniment Vocal and chorus scores without accompaniment
		Women's (treble) voices
Secular	Sacred	Full scores
M1543 M1543.3 M1543.5	M2033 M2033 --- M2033	Orchestral accompaniment   General   With recitation Other accompaniment (string orchestra, band, other ensemble of 2 or more instrument, electronic acc.)
Secular	Sacred	Vocal scores
M1544.5 M1544 M1544.3 M1544.5	M2033.5 M2034 --- --- M2033.5	Vocal and choruses without accompaniment Vocal scores with piano (or organ for sacred choruses) accompaniment   General   With recitation Vocal and chorus scores without accompaniment
Secular	Sacred	Excerpts
M1545 M1546 M1546.3	M2035 M2036 ---	Orchestral accompaniment Piano (or organ for sacred choruses) accompaniment Vocal and chorus scores without accompaniment
Collections of both accompanied and unaccompanied works
Secular	Sacred
M1547	M2060	Collections of both accompanied and unaccompanied works
Accompaniment of 1 instrument or unaccompanied
Secular	Sacred	Accompaniment of keyboard instrument Note: LC class numbers in subject authority records for choruses with accompaniment of piano (4 hands) indicate that "piano (4 hands)" is considered to be 1 keyboard instrument. LC class numbers for in subject authority records for choruses with accompaniment of pianos (2) also fall within this range (M1548-1570 and M2061-M2080). However, in some LC bibliographic records, choruses with accompaniment of 2 pianos are sometimes classed in M1543.5
M1548 M1549 M1550 M1551	M2061 M2062 M2063 M2064 M2065 M2066 M2067 M2068.A-Z	Collections (including collections with acc. of other solo instrument)   2 or more types of chorus   mixed voices   men's voices   women's (treble) voices Special seasons and occasions   Christmas   Easter   Thanksgiving   Other, A-Z (for a complete list, see Class M)
M1552 M1560 M1570	M2072 M2073 M2074 M2075 M2076 M2077 M2078.A-Z M2079.A-Z	Separate works   mixed voices   men's voices   women's (treble) voices Special seasons and occasions   Christmas   Easter   Thanksgiving   Other, A-Z (for a complete list, see Class M)   works with liturgical text (for a complete list of texts, see Table M6)
Secular	Sacred	Accompaniment of 1 instrument other than keyboard
M1574 M1575 M1576 M1577	M2080.4 M2080.5 M2080.6 M2080.7	2 or more types of chorus (collections only) mixed voices (collections and separate works) men's voices (collections and separate works) women's (treble) voices (collections and separate works)
Secular	Sacred	Unaccompanied
M1578 M1579 M1580 M1581	M2081 M2082 M2083 M2084 M2085 M2086 M2087 M2088.A-Z	Collections   2 or more types of chorus   mixed voices   men's voices   women's (treble) voices Special seasons and occasions   Christmas   Easter   Thanksgiving   Other, A-Z (for a complete list, see Class M)
M1582 M1590 M1600	M2092 M2093 M2094 M2095 M2096 M2097 M2098.A-Z M2099.A-Z	Separate works   mixed voices   men's voices   women's (treble) voices Special seasons and occasions   Christmas   Easter   Thanksgiving   Other, A-Z (for a complete list, see Class M)   works with liturgical text (for a complete list of texts, see Table M6)
Secular	Sacred	Unison
M1609	2101.5	Unison choruses, with and without accompaniment

Cutter numbers for special texts (for a complete list of texts, see Table M6)
If more than one language is present and one of those is Latin, use "L" in the cutter number.
  __11 Agnus Dei
  __14 Alma Redemptoris Mater
  __16 Ave Maria
  __161 Ave Maria Stella
  __165 Ave Verum corpus
  __169 Beatus vir
  __25 Cantate Domino
  __34 De profundis
  __373 Dixit Dominus
  __4 Gloria in excelsis Deo
  __5 Kyrie eleison
  __6 Magnificat
  __62 Miserere mei
  __7 Nunc dimittis
  __77 Regina Caeli
  __8 Salve Regina
  __82 Stabat Mater
  __9 Te Deum
  __94 Veni Creator Spiritus
For special texts not listed in Table M6, class works by medium of performance.

The M schedule doesn't offer a solution to special texts in languages other than those listed in the Table M6, but begin with the letter of one the languages listed there (e.g., "L" is used for Latin, and cannot be used with Latvian, Lithuanian, etc., special texts). The cuttering directions use up all the available numbers under a given letter, so unless a different lettering system were introduced for letters already occupied, there's no class legitimately available.

Several workarounds are possible:

1. Add a cutter number between "L" and the number for the text (e.g., La, Li),
2. Class with medium of performance instead of special texts,
3. Interfile all languages beginning with a specific alpha character without regard for their differences
Source: dialog on MLA-L, Geraldine Ostrove (LC), Joe Bartl (LC), and Chuck Herrold (Carnegie Library of Pittsburgh)