Here are 4 etudes written by Mazas (for violin) adapted for trumpet and transposed in various keys.
Jacques Féréol Mazas (born 23 September 1782 in Lavaur – died 26 August 1849 in Bordeaux) was a French composer, conductor, violinist, and pedagogue. His compositions for violin are, for the most part, studies and duets for young string players of all abilities that constitute methods for both violin and viola.
