From 1962 to 1965 he was ballet conductor and répétiteur at the Kulturinsel Halle. In 1965 Wenzel became musical director at the Thalia Theater (Halle) [de]. In 1969 he changed again to the Landestheater as conductor and composer. In 1976 he founded the Composer class Halle [de]. The classes still exist today in Halle, Dresden, Magdeburg and Zeitz. Children and young people are accompanied there in the creative, compositional handling of sheet music and work together with musicians on their first own pieces.
From 1978 to 1988 he was conductor of the Staatskapelle Halle. From 1988 Hans Jürgen Wenzel worked as a freelance composer and conductor in Berlin and Halle, his special commitment was to New Music. He was the founder and director of special ensembles for new music, e.g. the Ensemble Konfrontation [de] (Halle), the Ensemble Phorminx [de] (Darmstadt) and the Ensemble United Berlin.
Geschichte vom alten Adam, opera (text I. Rähmer after Erwin Strittmatter), 1972/73
Händel-Pasticcio for 2 actors, mezzo, tape, choir and orchestra 1984–86
Vocal pieces
Schwarze Asche, weiße Vögel, Solo cantata for baritone and string orchestra, 1966/67
DENKMALSTANDORT, chamber oratorio to Prometheus 1982 for speaker, mezzo, bass, child's voice, chamber choir and instruments, texts by various poets, 1981/82
Orchestra and concert works
Concerto for flute and orchestra, 1966
Concerto grosso, 1968
Concerto for cello and orchestra, 1968/69
Train Symphony, 1970
Concerto for large orchestra, 1974
I. Tardo
II Pressante
III Teneraments
Concerto for violin, string orchestra, harpsichord and percussion, 1974
12 exhibition music, 1977–86, including the Schult-Musik (1980), the Eröffnungsmusik (1978) and the Trio (1980) for Otto Möhwald [de]
4th string quartet, 1977/81
Approximation, for flute, clarinet, trumpet, 2 cellos and 2 percussionists, 1980
Metallophonie I, exhibition music for metal works of different forms, material and sound possibilities as well as 3 flutes, trumpet, viola and cello, 1981
Double musik I und II, 1983/84 (joint composition with Friedrich Schenker)
Second Bauhaus music for six wind instruments, 1986
Gerd Belkius: Hans Jürgen Wenzel: Konzert für Violine und Streichorchester.[2] In Musik und Gesellschaft 26 (1976), pp. 76–80.
Metamorphosen dreier Themen Georg Friedrich Händels von Hans Jürgen Wenzel. In Musik und Gesellschaft 28 (1978), pp. 273–277
Hans Jürgen Wenzel. In Sigrid Neef (with Hermann Neef): Deutsche Oper im 20. Jahrhundert. DDR 1949–1989. on WorldCat Lang, Berlin 1992, ISBN3-86032-011-4, p. 525 ff.
Wenzel, Hans Jürgen. In Axel Schniederjürgen (ed.): Kürschners Musiker-Handbuch. 5th edition Auflage, Saur Verlag, Munich 2006, ISBN3-598-24212-3, p. 511.
Hans Jürgen Wenzel gestorben. In MusikTexte 123 (2009), p. 1.