"Mass" is a type of composition, so in the catalog, every instance of this piece with have that special library generic title added to help us find it : genre, medium, number, key -- masses, K. 317, C major
A keyword search using the most important of those elements will find almost every instance of this concerto in the Library:
Use what you know to search the catalog and look in the catalog record. A keyword search on mozart coronation mass would also find that same DVD and show us that the Coronation Mass is also K. 317:
Or use the online music encyclopedia from Oxford Music Online.
