Use the column to the left titled Tweak your results to limit your search.
Use the Resource Type facet to pick whether you want books, scores, audio recordings, video, etc.
Use the Subjects to determine what an item is about or what type of music the item contains. Subjects will also tell you if the item contains is a score, vocal score, score and parts, etc. and can be found in the details of an item record as well as the filters to the left.
To see the full contents of an item, you must scroll down to the Details section.