Orchestra

• 1960 Sinfonia da camera for oboe/alto hoboe, clarinet/saxophone, bass clarinet, french horn, 4 percussionists, 4 violas, 2 celli and double bass, opus 1
• 1961 Coloratura I for string orchestra, two electr. guitars, 2 tam-tam and tape
• 1962 Coloratura II for chamber orchestra, electr. guitar, mandoline, 3 percussionists and piano
• 1962–1963 Coloratura III for chamber orchestra, electr. guitar, organ/vibraphone
• 1963 Coloratura IV for orchestra, 2 saxophones, piano and organ
• 1963 Antiphonia I for orchestra, saxophone, electr. guitar and piano
• 1965 Antiphonia II for chamber orchestra
• 1970 Antiphonia III for orchestra, electr. organ and vibraphone
• 1970 Colossus Metamusic for large orchestra, cello solo, piano, tape and slide projector
• 1970 Decadenza II for orchestra, tape and slides ad lib
• 1970 Senza Metamusic for string orchestra
• 1971 Labor meta-music for chamber orchestra
• 1972 Life per complesso da camera ed orchestra
• 1973 Alla Marcia metamusik for large orchestra, 6 brass winds, female choir of the Salvation Army, Stroboscope and tape
• 1973 Five Pieces for orchestra
• 1975 Anticanti for string orchestra and mixed choir
• 1977 Morendo for orchestra, 2 flugelhorn, 2 electr. guitars, electr. organ, piano, celesta, mixed choir and tape
• 1979 Musica nera for chamber orchestra
• 1980 Monodia for orchestra, electr. guitar, electr. bass guitar, electr. organ and synthesizer
• 1981 Concerto per Organo Grande ed Orchestra for organ and orchestra
• 1984 1984 for electronic instruments (electr. organ, synthesizer) piano, orchestra and tape
• 1985 Materia for chamber orchestra, mixed choir, synthesizer and organ
• 1990 Contra for chamber orchestra with alto saxophone
• 1996 Interna for orchestra
• 1997 Estonia for string orchestra
• 1999 Sonora concerto for guitar and string orchestra

Wind band

• 1977–1978 Attacca for wind band and tape
• 1984/1986 Energia I for wind band, synthesizer, percussie, electr. bass guitar and double bass
• 1987 Paraphonia for wind band, string quartet and sampling synthesizer

Chamber music

• 1960 Wechselspiel I for cello solo
• 1961 Wechselspiel II for flute solo
• 1961 Wechselspiel III for piano and percussion
• 1972 Video 1 — synaesthetic etudes for 8 strings (2 violins, 2 violas, 2 celli, 2 double basses)
• 1972 Down for flute solo
• 1974 Soli for wind quintet
• 1975 Unisono duo for bassoon and harpsichord or piano or harp
• 1977 Tremor per violino solo e nastro
• 1978 Intimi for bass clarinet, bassoon and tape
• 1979 Kindertotenlied for wind quintet and tape
• 1980 Stone movements for clarinet, trombone, cello and piano
• 1983 Aria for brass quintet
• 1983 Ancora Meta-Music for string quartet (two violins, viola, cello)
• 1983 Diaphonia for piano and tape
• 1984 Strano for wind quintet and tape
• 1984 Memory — Erinnerung for saxophone solo
• 1987 Chorale for saxophone quartet (SATBar)
• 1988 Once for clarinet, cello and piano
• 1990 Scaena for saxophone quartet and synthesizer
• 1990 Contra for chamber ensemble
• 1994 Intra for saxophone and guitar
• 1994 Resign for saxophone quartet and synthesizer
• Stone Movement for clarinet, cello, trombone and piano

Vocal music with orchestra or instruments

• 1961/1963 Chains — Mirrors Electro-acoustic transformations for female voice
• 1975 Cultura Meta-music for four organs, two sopranos, bariton, electr. guitar, electr. bass guitar and two percussionists
• 1986 Im wunderschönen Monat Mai — Frühlingslied for soprano, bass clarinet and piano

Choir

• 1961 Canzona for sic choirs and two percussionists
• 1986 Kyrie for children choir, strings and piano

Stage music

• 1981 Trauma Meta-opera for Radio

Piano

• 1962 Courante I, II and III
• 1979 Stereos for two pianos
• 1984 Dead ends
• 1991 Exit for piano and synthesizer

Organ

• 1961–1973 New organ music

1. Some of these...(1961/63)
2. Pour Madame Bovary (1962/1973)
3. Encores (1962/73)
4. Eternes (1964/73)
5. Decadenza I, metamusic (1968/73)
6. Farewell, metamusic (1970/73)

Percussion

• 1997 Interior Drums for six percussionists

Film music

• 1968 Supersonics

Electronische music

• 1967 Neutron Star
• 1970 Ultra
• 1988 Silence XX for laser projection and tape

He also wrote a book:

• Morthenson, Jan W: Nonfigurative Musik. Vorwort: Heinz-Klaus Metzger. Übertragung vom schwedischen Manuskript: Hans Eppstein. Stockholm, Wilhelm Hansen. 1966. 83 p,