I feel tha J River Media Center is a fabulous program. Unfortunately, it is not friendly to classical music lovers and requires a lot of time and effort to set up for classical music.
Some suggestions for the next version:
1. Have a wizard that would prompt the user to set up a scheme for classical. First a single field is necessary that referrs to a work, not a song. The name of a work should have subparts that include the composer, name of the work, and the performing artist(s) in one field (Beethoven, Violin Concerto in D major, Op. 61: Krebbers/Haitnk/Concrrtgebauw);
2. A view scheme should be made to correlate composers, genres, and artists to the "works";
3. A means of linking to text on the web which might contain a eg a review, a libretto, etc