The impressive collection of some 30,000 Long-Playing records and over 40,000 CDs, filed by composer as well as by genre, holds many hard-to-find gems, such as recordings of rare works and unknown operas, albums unavailable long-since, as well as recitals by singers and instrumentalists from the beginning of the 20th century. An index containing no fewer than 170,000 entries allows each recording to be easily located.