Mi-parti is an orchestral work by the Polish composer Witold Lutosławski, composed from 1975 to 1976 on a commission from the City of Amsterdam for the Concertgebouw Orchestra.^[1] The name broadly means in two equal but different parts, referring to the treatment of the material rather than the large-scale structure of the piece.^[2]

The first performance took place on 22 October 1976 in Rotterdam, with the composer conducting the Concertgebouw Orchestra.

The work calls for a large orchestra made up as follows:^[1]

• woodwind: 3 flutes (all doubling piccolo), 3 oboes, 3 clarinets (3rd doubling bass clarinet), 3 bassoons
• brass: 3 trumpets in C, 4 horns, 3 trombones, 1 tuba
• percussion: timpani, 3 percussionists (bells, marimba, xylophone, glockenspiel, tam-tams, cymbals, vibraphone without motor)
• celesta, harp, piano
• and strings (8 first violins, 7 second violins, 6 violas, 6 cellos and 4 basses).

Awards:

• for EMI recording: International Critics’ Award, 1979; Deutsche Schallplattenpreis 1977
• for the piece: State Prize, 1st grade 1978