These are books with knowledge that I believe to be crucial for classical music and classical piano.
Music Theory & Composition
- Traite D’harmonie by Henri Reber (1862)
- Treatise on Melody by Anton Reicha (1814)
- A Treatise on Counterpoint & Fugue by Luigi Cherubini (1854)
- Hamilton’s Catechism on the Nature, Invention, Exposition, Development And Concatenation, of Musical Ideas by James Alexander Hamilton (1838)
Piano Performance
- Chopin: Pianist and Teacher: As Seen by His Pupils by Jean-Jacques Eigeldinger (1986)
- The Embellishments of Music by Louis Arthur Russel (1894)
- Musical Expression, Accents, Nuances, and Tempo, in Vocal and Instrumental Music by Mathis Lussy (1874)
- Complete Method of Singing by Louis Lablache (1851)
- Art of Playing the Piano Forte by Hummel (1827)
Old Music Theory 