Andriessen's music thus departs from post war European serialism and its offshoots. He has also played a role in providing alternatives to traditional performance practice techniques, often specifying forceful, rhythmic articulations, and amplified, non-vibrato, singing. Other notable works include "Workers Union" (1975), a melodically indeterminate piece "for any loud sounding group of instruments"; "Mausoleum" (1979) for 2 baritones and large ensemble; "De Tijd" ['Time'] (1979–81) for female singers and ensemble; "De Snelheid" ['Velocity'] (1982–83), for 3 amplified ensembles; "De Materie" ['Matter'] (1984–88), a large four-part work for voices and ensemble; collaborations with filmmaker and librettist Peter Greenaway on the film "M is for Man, Music, Mozart" and the operas "Rosa: A Horse Drama" (1994) and "Writing to Vermeer" (1998); and "La Passione" (2000–02) for female voice, violin and ensemble. Andriessen's primary publishers are Boosey & Hawkes and Donemus. Complete list of works: