- The Oster collection [microform] : papers of Heinrich Schenker /
- File 38: Draft Material for Der Freie Satz and Early Articles /
- Part 1A /
- Recto: Musical example from Ludwig van Beethoven, Concerto, piano and orchestra, No. 4, Op. 58, 1st movement, measure 123 (an earlier version of figure 65, 4 of Der freie Satz)