Royal Winter Music
Both works are inspired by characters from Shakespeare. The first work (described as a sonata) was completed in 1976, and is in six movements. The first part, Richard of Gloucester gives the overall work its name (from Richard's opening monologue Now is the winter of our discontent).
The second sonata, written in 1979, continues the Shakespearean theme in three parts. Henze has stated that the work as whole is now complete.
First Sonata on Shakespearean Characters 
Second Sonata on Shakespearean Characters 
- Henze, Hans Werner Royal Winter Music liner notes, Wergo.