Оригинал: Piano Etudes Level 9. Keith Snell. Piano Method sheet music. Piano Solo sheet music. Piano Etudes Level 9 composed by Keith Snell. Level 9.
Превод: Препоръчани композитори включват Czerny, Beyer, Беренс, Кунц, Kühler, Gurlitt, Streabbog, както и много други. За пиано.