Lead sheets
You can download charts of Jochen's original music from his last three Quartet albums (Somewhere, meeting nobody, We make the Rules, and Charm Offensive), the 3 songs he wrote for Nils Wogram's Root 70 over the years, and the 2 songs on Melissa Aldana's trio record. For 25 bucks. Most charts are handwritten C lead sheets, not very well written but somewhat legible, a few are music notation software generated, a few have separate parts and all are either .jpg or .pdf