Sociocultural and socially critical questions, as in Das Theater der Wiederholungen/The Theatre of Repetitions (2003) are examined as closely as intrinsically musical and music-cultural problems ("I hate Mozart", 2006).
Another focus is the "recycling" of historic music, which Lang creates using self-programmed patches, applying filter and mutation processes (as in the "Monadologie" cycle).
In 1975, he moved to Graz to study philosophy and German philology, jazz (Dieter Glawischnig), piano (Harald Neuwirth), counterpoint (Hermann Markus Pressl), and harmony and composition (Andrzej Dobrowolski).
In 1987, he co-founded the composer's club "die andere saite" (roughly "the alternate string", a German-language pun referring also to "the other side").
[2] Since 2000, Lang has given numerous lectures in Europe and abroad, including at the Darmstadt Summer Course, Ostrava Days, Impuls Graz, Berlin's University of the Arts, Vienna's University of Music and Performing Arts and the Vienna Conservatory, as well as holding guest lectureships in, among other cities, Munich, Zurich, Basle, Oslo, Madrid, London, New York[2] and Paris.
[4] Lang has collaborated with dancers and choreographers such as Xavier Le Roy, Willi Dorner, Christine Gaigg and Silke Grabinger.
There are currently about 20 works in this genre, among them: Das Theater der Wiederholungen, based on the writings of the Marquis de Sade and William S. Burroughs and choreographed by Xavier Le Roy, was premiered at the festival Steirischer Herbst, Graz in 2003.
[19][20] Montezuma – Fallender Adler, based on a text by Christian Loidl, for 6 voices, choir, jazz combo, turntables, ensemble and pre-recorded electronic sounds, is a work commissioned by the Kulturhauptstadt Linz09, but was not performed in Linz.
[21][22][23] Der Reigen, after a libretto by the Viennese writer-director Michael Sturminger and based on the play by Austrian dramatist Arthur Schnitzler, was commissioned by the German Schwetzingen Festival, where it had its premiere in 2014.
[2][24] Der Golem, for voices, choir, large orchestra and jazz trio based on the novel by Gustav Meyrink and a video libretto by Peter Misotten, was premiered at the Nationaltheater Mannheim in 2016.
The original libretto is replaced by a new one written by André Bücker based on Lord Byron's Darkness and Jean Paul's Rede des Toten Christus vom Weltgebäude herab (Speech of the Dead Christ from the World Building).
[27][28][29] HIOB, an opera for voices, choir, orchestra and jazz trio, based on Michael Sturminger's libretto after the novel Job by Joseph Roth, was premiered in February 2023 at the Stadttheater Klagenfurt to standing ovations.
With the use of a computer programme he developed, the original structures are disintegrated and then reassembled with the help of cellular automata and granulators, similar to the experimental film techniques of the destructivist Raphael Montañez Ortiz.
[46] The Hermetika series, begun in 2008, consists of choral pieces based on a collection of hermetic texts ranging from ancient mystical writings to quasi-dadaistic enigmatic codes.