Musical documents, that is, documents whose primary content is printed music, introduce interesting design challenges for presentation in an online environment. Considerations for the unique properties of printed msic, as well as users’ expected levels of comfort with these materials, present opportunities for developing a viewer specifically tailored to displaying musical documents. This paper outlines five design considerations for a music document viewer, drawing examples from existing digital music libraries. We then present our work towards incorporating these considerations in a new digital music library system currently under development.