I was preparing this for someone else but thought I’d share here. Here’s how to embed a .mp3 audio file in Google Sites.
On the page you want to embed audio enter edit mode and move the cursor to where you want the audio player to appear. Then from the Insert menu, at the very bottom select More gadgets…
In the search box enter ‘Google Audio Player’ and click Search.
A couple of options should appear. There isn’t an official player gadget as such but ‘google Audio Player’ works well (it’s just a wrapper by Philippe Chappuis for an audio player Google uses in Google Reader – here’s the xml).
For the .mp3 file you need the location of it online. If you haven’t got an online location for it you can upload the file to the site via the Manage Site menu but you might have problems with upload limits). I usually untick the ‘Include a border around gadget’
Click OK and save the page and that’s it …
