Set the networking to "bridge" to simplify things, you might need to set a static IP address on the VM. In Windows 7, DO NOT TOUCH ANY OF THE SHARING PROPERTIES, let it at default. Create a share of your music folder, make sure you have a dedicated user for that share (and put a password on that user), make sure that that user can access the music folder and play everything in Windows, set the permission for that user to at least can "read" your music folder (under security tab), and that user listed in the sharing tab->advanced sharing.
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