My collection consists or approximtely 4,000+ LPs and 2,000 CDs. I started in the early 60s typing on 3x5s information about every piece on each record and CD. Each card is filed alphabetically by composer and in some cases I have created files for various instruments and performers. All of these are in the same file drawers, filed alphabetically. Each card contains the composer and his/her dates, the title of the composition, label name and number on the label, timing, format, performers, orchestra, conductor and the name of the person who wrote the program notes and the date the notes were written if available. All LPs are on my shelves alphabetically by recording company and numerically by the number placed on the recording by the record company. This way I do not have to add anything to the record. Needless to say I have thousands of 3x5s but any recording or any selection on any of the records or CDs may be located quickly. It is also very important to "keep up." I have gone through several typewriters over the years. I hope they keep making them!
All of my books are in the same file system but I have them arranged on the shelves by genre or by composers. All of my scores are arranged by composers. I am very fortunate to have a dedicated listening room(20x30 with 14 ft. cathedral ceiling)which is full of all of my books, scores and recordings, and my playback system. Great to be in after a day of teaching!