J.S. Bach: Four duets BWV 802-805 (piano solo). Composed by Johann Sebastian Bach (1685-1750). Edited by Rudolf Steglich. For Piano. Henle Music Folios. Pages: 15. SMP Level 9 (Advanced). Softcover. 20 pages. G. Henle #HN161. Published by G. Henle (HL.51480161).
About SMP Level 9 (Advanced)
All types of major, minor, diminished, and augmented chords spanning more than an octave. Extensive scale passages.