Here are some logos I use for my music folder, it's the "music note" symbol I extracted from the iTunes logo.

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A folder for your music. Two variations. Nifty, eh?

Part of the Folders2 set, you can find more here.

Generic logo I use for my music folder.

Another generic music one. This is a guy with guitar, transparent with reflection and slight glow. Hes just an outline so the inside of him is transparent not filled.