1738

Johann Philipp Eisel, in his text Musicus autodidactos, oder der sich selbst informirende Musicus, includes the following: “What is to be noted concerning the clefs? Nothing more than this, that the alto trombone has the alto clef as prescribed in the parts, where as the quint and quart trombones generally have the bass clef as prescribed in the parts” (Guion, Trombone 44).