 Two French trumpet technique books, authored by Jean-Baptiste Arban and Saint-Jacome, were translated into English for use by American players.According to some, due to a misunderstanding arising from differences in pronunciation between French and English, the commonly used brass embouchure in Europe was incorrectly interpreted.Callet attributes this difference in embouchure technique as the reason the great players of the past were able to play at the level of technical virtuosity which they did, although the increased difficulty of contemporary compositions for brass seem to indicate that the level of brass technique achieved by today's performers equals or even exceeds that of most performers from the late 19th and early 20th centuries.