M200 - M212 piano four hands
M213 piano, five, six, eight, etc. hands
M214 - M215 two pianos, two performers
M310 - M314 piano and two strings
M312 piano, violin, violoncello
M315 - M319 piano and two winds
M325 - M329 piano and two plucked instruments (guitar, harp, etc.)
M410 - M414 piano and three strings
M412 piano quartets (piano, violin, viola, violoncello
M415 - M419 piano and three wind instruments
M420 - M424 piano and three wind and/or string instruments
ex. piano horn violin; piano clarinet cello
M425 - M429 piano and three plucked instruments
M510 - M514 piano and four string instruments
M512 piano quintets (piano, two violins, viola, violoncello)
M515 - M519 piano and four winds
M520 - M524 piano and four wind and/or string instruments
piano and four plucked instruments
Compositions for piano and two, three and four other solo instruments are entered under the heading trios, quartets and quintets followed by specification of instruments.
For example: