During his life three volumes of etudes written by Marinus Komst were published (“12 Etudes characteristiques”, “Dix études brillantes” and “15 études pour Trompette”). A fourth volume, the present “12 Exercises” composed by Marinus Komst in 1930, has never been published before. A folder with manuscripts of these exercises (as Komst himself called them) was found by his biographer Ralph Henssen in a pile of sheet music from his estate. When Komst composed these virtuoso pieces he was only 22 y...