This is a minimalist piece in just about every sense of the word. It's quite short, the note range is small, the rhythm is sparse and the dynamic restricted to variations on soft. It's amazingly effective though.
Performance duration (approx): 4'30"
Difficulty guide: 6-8
Difficulty level, roughly compared to ABRSM exam grades. 0 is total beginner, 9 is advanced (beyond grade 8).
