Ernesto Köhler |
| 20 Easy Melodic Progressive Exercises, Op. 93, Book 1 |
| 20 Easy Melodic Progressive Exercises, Op. 93, Book 2 |
| 25 Romantic Etudes, Op. 66 |
| 30 Virtuoso Etudes, Op. 75, Vol. 1 |
| 30 Virtuoso Etudes, Op. 75, Vol. 2 |
| 30 Virtuoso Etudes, Op. 75, Vol. 3 |
| Forty Progressive Duets, Op. 55, Part 1 |
| Forty Progressive Duets, Op. 55, Part 2 |
| Valse Allemande |
