Organ - easy to intermediate - Digital Download SKU: S9.Q41648 Erstausgabe. Composed by Joseph Haas. This edition: Sheet music. Downloadable. Schott Music - Digital #Q41648. Published by Schott Music - Digital (S9.Q41648). Joseph Haas (1879–1960), a pupil of Max Reger, is regarded as one of the most important figures of early 20th century German Catholic church music. The forty chorale preludes, all in fughetta form, are published here for the very first time.