The CHARLIER COMPANION, the most famous book in Triplo Press's COMPANION SERIES, is essentially second trumpet parts to the 36 Etudes Transcendantes of Theo Charlier evolved from many years of using etudes from the standard pedagogical literature with students and playing 'behind' them to help with conceptions of sound, style, pitch, tempo, and phrase. In my experience, it was quickly found that focus on technique quickly gave way to a much more musical experience. These 36 etudes are fun, challenging, and satisfying by themselves, and can be played and studied as stand-alone works. They are most effective, however, when played as conceived: as duets to the 36 Etudes Transcendantes by Theo Charlier, published by Alphonse Leduc of Paris, France. Individuals may also perform and study these etudes along with the compact disc recording by David Baldwin of the Leduc publication, available through the International Trumpet Guild.