P. M. Dubois Douze Études Variées pour Trompette

French composer, Pierre Max Dubois (1930-1995) significantly contributed to the wind repertoire. His 12 Various Studies for Trumpet was published in 1959 and remains prominent in the instrument's study repertoire. 

Dubois' 12 Various Studies addresses elements of articulation, chromaticism, rhythm, scales, intervals, breath control, performance directions, dynamics, range, ornamentation, and variations in time and key signatures, amongst other aspects. 12 Various Studies is essential to the advanced trumpeter to ensure a high standard of technical progression.