A portable electronic device integrating compact storage for a large collection of musical scores, rapid access to any score in the collection, a display adjustable for various viewing conditions and individual needs, support for annotation that preserves the original score, and simplified page turning. The device includes two touch-sensitive displays hinged together so as to approximate the familiar form of a musical score. The device opens to display two pages of music, one on each of the touch-sensitive displays. The device may be placed on a music stand or piano ledge in the same manner as a traditional musical score. Removable mass storage medium allows virtually unlimited expansion of a score collection. Menu selection and subsequent random access to selected scores result in rapid retrieval of any score a musician may require. The touch-sensitive surface of the touch-sensitive displays allows menu selection, display adjustment, page-turning, and other features at the touch of a finger, as well as non-destructive annotation at the stroke of a stylus. In sum, the device enhances the interaction between musician and musical score in ways that transform the manner of a musician's ownership and use of a large collection of scores.