Composition
Write a pentatonic extract for any combination of instruments. I am interested in ATMOSPHERE and GESTURE and you must only use 12356 of a major scale
There are notes and examples here: https://alevelmusic.com/alevelcompositionhelp/3-composition-into-the-c20/new-scales/
History
If you have it, read the Into the Twentieth Century chapter of the Rhinegold Study Guide