Catalog › Musk
63 musk perfumery materials in the PerfuMate catalog, each described and classified, with CAS numbers where one exists. 2 natural, 61 synthetic. By volatility band: 63 base.
Counted from the accords published to the PerfuMate community, which are PerfuMate's own reference accords. The figure is how many of them use the material.
A material is filed under every sub-category that fits it, so these add up to more than 63.