Bourdon is in the key of D minor. It has a lyrical harmonized melody in the right hand, accompanied by a repeated pattern in the left hand, which repeast throughout the entire piece. This makes it easy for the student to pay complete attention to the right hand. "Bourdon" refers to musically low registers, for example the lowest course of a lute, the lowest drone pipe of a bagpipe, or the lowest bell of a set. This helps explain the meaning of the left hand drone.
Gustavo J. do Carmo, masters piano student, The University of Iowa