an

Anthems

bd

Ballads

bt

Ballets

bg

Bluegrass music

bl

Blues

cn

Canons and rounds

ct

Cantatas

cz

Canzonas

cr

Carols

ca

Chaconnes

cs

Chance compositions

cp

Chansons, polyphonic

cc

Chant, Christian

cb

Chants, Other religions

cl

Chorale preludes

ch

Chorales

cg

Concerti grossi

co

Concertos

cy

Country music

df

Dance forms
Includes music for individual dances except those that have separate codes defined:  mazurkas, minuets, pavans, polonaises, and waltzes.

dv

Divertimentos, serenades, cassations, divertissements, and notturni
Instrumental music designated as a divertimento, serenade, cassation, divertissement, or notturno.

ft

Fantasias
Includes instrumental music designated as fantasia, fancies, fantasies, etc.

fl

Flamenco
Generic term which refers to all the Flamenco styles, or "palos", and to other forms of song and dance coming from the folkloric tradition of Spanish gypsies.

fm

Folk music

fg

Fugues

gm

Gospel music

hy

Hymns

jz

Jazz

md

Madrigals

mr

Marches

ms

Masses

mz

Mazurkas

mi

Minuets

mo

Motets

mp

Motion picture music

mu

Multiple forms

mc

Musical revues and comedies

nc

Nocturnes

nn

Not applicable

op

Operas

or

Oratorios

ov

Overtures

pt

Part-songs

ps

Passacaglias
Includes all types of ostinato basses.

pm

Passion music

pv

Pavans

po

Polonaises

pp

Popular music

pr

Preludes

pg

Program music

rg

Ragtime music

rq

Requiems

rp

Rhapsodies

ri

Ricercars

rc

Rock music

rd

Rondos

sd

Square dance music

sn

Sonatas

sg

Songs

st

Studies and exercises
Used only when the work is intended for teaching purposes (usually entitled Studies, Etudes, etc.).

su

Suites

sp

Symphonic poems

sy

Symphonies

tl

Teatro lirico
Used for a large number of more specific terms which describe Spanish and Spanish American theatre music:  "tonadilla escénica", "fiestas de música", "sainetes líricos", "entremeses cómico-lírico", etc.

tc

Toccatas

ts

Trio-sonatas

uu

Unknown
Indicates that the form of composition of an item is unknown.  Used when the only indication given is the number of instruments and the medium of performance.  No structure or genre is given, although they may be implied or understood.

vr

Variations

vi

Villancicos
Characteristic form of Spanish polyphony, religious or secular, from the 16th to 18th centuries.  Religious villancicos were usually sung in important ceremonies (including Christmas, when these songs were sometimes called "pastoradas").

wz

Waltzes

za

Zarzuelas
Term applicable to all musical plays taking that name, from the "fiestas de zarzuela" of the 17th/18th-centuries to the so-called "zarzuela moderna" ("modern zarzuela") from the mid 19th to the mid 20th-century.

zz

Other
Indicates a form of composition for which none of the other defined codes are appropriate (e.g., incidental music, electronic music, etc.).

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No attempt to code