59 pieces :
7 pieces in C major and C minor
7 pieces in Db major and C# minor
7 pieces in D major and D minor
7 pieces in Eb major and Eb minor
7 pieces in E major and E minor
7 pieces in F major and F minor
7 pieces in F# minor and G♭ major
7 pieces in G major and G minor
3 pieces in Ab major