From the Music Library homepage, select CDs and LPs in the drop-down menu to the left of the search box. Include the specific instrument name your search. Add specific artists, composers, etc., as appropriate for your search. Include "cd" in your search to find only compact disc recordings.
For example:
To find Bach Well-tempered clavier performed on harpsichord, enter "bach well-tempered clavier harpsichord" in the recordings search box.