This was all I could find in the way of free downloads, there are alot of so called 'Egyptian music' at different download.com type places, but from what I saw, all were Arabic, not ancient egyptian.

Ancient Egyptian free music dowloads (for personal use allowed) ~ Free music download. I personally really loved the 'Temple Dance' number.

Here is a short page with information on ancient Egyptian music ~ Music in Ancient Egypt

(also has music information on ancient Rome, Greece, and alot of good general info and has a short list of cd's of modern interpretation of ancient music in credits)