악보

원본

Hermann, Friedrich. The first exercises for interaction. Op.21. Hermann, Friedrich. 2 Violins. duet. Vol.1. pieces 1 to 13. Vol.2. pieces 14 to 25.

헤르만, 프리드리히. The first exercises for interaction. Op.21. 헤르만, 프리드리히. 2 Violins. 이중주. 1 집. pieces 1 to 13. VOL.2. pieces 14 to 25.