Another focus of his work is composition, examples of which are his trio albums "Echoes" and "Tender Tracks", his "Songbook"-Album, the soundtrack for the TV production "Nelken für Sansibar" (NDR) and the multimedia production "Die Reise hinter das Licht" (NGBK). His salsa-inspired composition "Goodbye" was recorded on CD by the Japanese Akira Matsuo Trio ("Besame Mucho" - Terasima Records)
Stephan Noel Lang is also occasionally active as a stage musician, e. g. on the silent film classic "Das Cabinet des Dr. Caligari" (on the occasion of the film anniversary at the original film location in Berlin-Weißensee), on the theatre monologue "Novecento" with Rainer Guldener (directed by Andreas Seyferth), or in the musical area (Vinyl LP "Godspell", with Uwe Kröger, among others).
As part of his teaching activities, he has created a comprehensive treatise on harmony with the title "Kompendium der Harmonie" (with numerous music examples from different epochs and genres) and a methodical piano school for beginners entitled "Tastentöne" (both previously unpublished).