Here's how to create a permalink for Naxos.
Example:
On the left side of a Naxos page, look for the "Show or Hide Static URL"
By clicking on the SHOW/HIDE URL, you will see the SJSU URLs for a track.
Remember to add the proxy URL.
http://libaccess.sjlibrary.org/login?url=http://sjsu.naxosmusiclibrary.com/streamw.asp?ver=2.0&s=99143%2Fsjsunml11%2F6802756