The lessons are taken directly from the Basic Piano Tuning Manual.
CHAPTER II - Muting the Piano
pp 12-17
2.2 Muting the Bichords (Upright)
Basic Piano Tuning Manual,
pp 13-16
5.2 Cycle of Fourths and Fifths Temperament (Basic Temperament)
Method 1: The Peanut-Butter-on-Toast Method,
pp 28-29
7.1.2 Upright Piano Treble
Using the Papp's Mutes
pp 45-47
