The search for a "PDF" of these notes is common because Wartke’s arrangements are famously dense. While many cabaret artists use simple accompaniment, Wartke’s piano parts are standalone compositions. Official Sources
You can find the official and community-transcribed versions of the notes at these locations: Bodo Wartke 90 Grad Noten Pdf 19
If you are looking for a challenging, funny, German-language piano piece, buy or “Der Zauberlehrling” as PDF. They are far more rewarding than chasing a phantom “90 Grad.” The search for a "PDF" of these notes
The arrangement is musically demanding. While the harmonies are relatively straightforward, the left-hand accompaniment requires significant precision to master the off-beat rhythms . German-language piano piece