I have a filing cabinet, with different categories such as orchestra parts, solo harp pieces, chamber music, chamber music, etc. For each category, the music is filed in the order in which I bought it. At the front of each category is a list with the names and numbers of each piece written on it. This is cross-referenced in a recipe card holder (small box). In the recipe card box, there are little alphabetical dividers. Under “B”, there is a recipe card for each composer whose name begins with “B”. For example, I have a card labelled “Bartok” in section “B”, and the card has the names and numbers of every orchestra part that I have by Bartok. This makes it very fast and easy to find music, but also to add to the collection.