In perfume lingo, musk is a type of note (or scent, if you will). Musk is used in a number of fragrances, especially in men's colognes, unisex colognes and women's perfumes that are oriental or woody. Musk is usually used as a base or bottom note.
Sometimes you'll see musk paired with amber, sandalwood, citrus, woody scents or water scents.
Perfume collector. Also work in a scented candle shop (which requires us to know the same ideas as perfumes).