Music Cataloging at Yale Call numbers
M6-M175 | M180-M298.5 | M300-M990 | M1000/M1100, etc. | M1005/M1105, etc. | M1500/M2000, etc. | M1528/M2018, etc. | M1611/M2102, etc. | MT179-MT735

Class numbers for music for 3 to 9 instruments
M300-M990

Note: M900-M990 applies to nonets and larger combinations of purely chamber music.
MX00-MX04 Organ and 2-8 or more instruments
MX05-MX09 Harmonium and 2-8 or more instruments
MX10-MX14 Piano and string instruments
MX15-MX19 Piano and wind instruments
MX20-MX24 Piano, string, and wind instruments
MX25-MX29 Piano and plucked instruments
MX30-MX34 Piano, string, and plucked instruments
MX35-MX39 Piano, wind, and plucked instruments
M340-M344 Piano and 2 other instruments Trios only
MX40-MX44 Piano, and 3 or more string, wind, and plucked instruments
MX45-MX49 Piano and 3 or more other instruments
MX49-MX53 String instruments
MX55-MX59 Wind instruments
MX60-MX64 String and wind instruments
MX65-MX69 Plucked instruments
MX70-MX74 String and plucked instruments
MX75-MX79 Wind and plucked instruments
MX80-MX84 String, wind, and plucked instruments
MX85 Other combinations of 3 or more specified instruments (including works with non-musical objects used as instruments)
MX86 Other combinations of 3 or more unspecified instruments
M990 Chamber music for instruments of the 18th century and earlier that are generally not used in the modern symphony orchestra

Class Instruments
MX00-MX04 Organ and 2-8 instruments
MX00 Miscellaneous collections
  Original compositions
MX01    General collections
MX02    Special collections and separate works
  Arrangements
MX03    Collections
MX04    Separate works
MX05-MX09 Harmonium and 2-8 instruments
MX05 Miscellaneous collections
  Original compositions
MX06    General collections
MX07    Special collections and separate works
  Arrangements
MX08    Collections
MX09    Separate works
MX10-MX14 Piano and X string instruments
MX10 Miscellaneous collections
  Original compositions
MX11    General collections
MX12    Special collections and separate works
         M312=piano, violin or viola, cello
            M312.4=piano and 2 other string instruments
         M412=piano, violin, viola, cello
            M412.2=piano, 3 violins
            M412.4=piano and 3 other string instruments
         M512=piano, 2 violins, viola, cello
            M512.2=piano, 4 violins
            M512.4=piano and 4 other string instruments
  Arrangements
MX13    Collections
MX14    Separate works
MX15-MX19 Piano and 2-8 wind instruments
MX15 Miscellaneous collections
  Original compositions
MX16    General collections
MX17    Special collections and separate works
  Arrangements
MX18    Collections
MX19    Separate works
MX20-MX24 Piano and 2-8 string and wind instruments
MX20 Miscellaneous collections
  Original compositions
MX21    General collections
MX22    Special collections and separate works
  Arrangements
MX23    Collections
MX24    Separate works
MX25-MX29 Piano and X plucked instruments
MX25 Miscellaneous collections
  Original compositions
MX26    General collections
MX27    Special collections and separate works
  Arrangements
MX28    Collections
MX29    Separate works
MX30-MX34 Piano and 2-8 string and plucked instruments
MX30 Miscellaneous collections
  Original compositions
MX31    General collections
MX32    Special collections and separate works
  Arrangements
MX33    Collections
MX34    Separate works
MX35-MX39 Piano and 2-8 wind and plucked instruments
MX35 Miscellaneous collections
  Original compositions
MX36    General collections
MX37    Special collections and separate works
  Arrangements
MX38    Collections
MX39    Separate works
M340-M344 Piano and 2 other instruments (Trios only; for quartets, quintets, etc., see MX40-MX44)
M340 Miscellaneous collections
  Original compositions
M341    General collections
M342    Special collections and separate works
  Arrangements
M343    Collections
M344    Separate works
MX40-MX44 Piano and 3 or more string, wind, and plucked instruments (Quartets, quintets, etc. only; for trios, see M340-M344)
MX40 Miscellaneous collections
  Original compositions
MX41    General collections
MX42    Special collections and separate works
  Arrangements
MX43    Collections
MX44    Separate works
MX45-MX49 piano and 3 or more other instruments
MX45 Miscellaneous collections
  Original compositions
MX46    General collections
MX47    Special collections and separate works
  Arrangements
MX48    Collections
MX49    Separate works
  string instruments
M349-M353 3 string instruments (Trios only; for quartets, quintets, etc., see MX50-MX54)
M349 Miscellaneous collections
  Original compositions
M350    General collections
M351    Special collections and separate works
  Arrangements
M352    Collections
M353    Separate works
MX50-MX54 4 or more string instruments (Quartets, quintets, etc., only; for trios, see M349-M353)
MX50 Miscellaneous collections
  Original compositions
X51    General collections
X52    Special collections and separate works
  Arrangements
X53    Collections
X54    Separate works
MX55-MX59 3 or more wind instruments
MX55 Miscellaneous collections
  Original compositions
MX56    General collections
MX57    Special collections and separate works
   MX57       Both woodwinds and brasses
   MX57.2       Woodwinds only
   MX57.4       Brasses only
  Arrangements
MX58    Collections
MX59    Separate works
MX60-MX64 3 or more string and wind instruments
MX60 Miscellaneous collections
  Original compositions
MX61    General collections
MX62    Special collections and separate works
  Arrangements
MX63    Collections
MX64    Separate works
MX65-MX69 3 or more plucked instruments
MX65 Miscellaneous collections
  Original compositions
MX66    General collections
MX67    Special collections and separate works
  Arrangements
MX68    Collections
MX69    Separate works
MX70-MX74 3 or more string and plucked instruments
MX70 Miscellaneous collections
  Original compositions
MX71    General collections
MX72    Special collections and separate works
  Arrangements
MX73    Collections
MX74    Separate works
MX75-MX79 3 or more wind and plucked instruments
MX75 Miscellaneous collections
  Original compositions
MX76    General collections
MX77    Special collections and separate works
  Arrangements
MX78    Collections
MX79    Separate works
MX80-MX84 3 or more string, wind, and plucked instruments
MX80 Miscellaneous collections
  Original compositions
MX81    General collections
MX82    Special collections and separate works
  Arrangements
MX83    Collections
MX84    Separate works
MX85 Other combinations of 3 or more specified instruments
MX86 Other combinations of 3 or more unspecified instruments
M990 Chamber music for instruments of the 18th century and earlier that are generally not used in the modern symphony orchestra; use:
M182+ 1 instrument of the 18th century and earlier and organ
M239,
M270-M271,
M282-M283,
M284-M285
1 instrument of the 18th century and earlier and piano
M177-M986 ensembles with both instrument(s) of the 18th century and earlier and modern instrument(s)

Comments to Mickey Koth Yale University Music Library
Last revised February 26, 2015.