Force Save AS

Is there a way to force a file to be saved instead of using the "default action". In my situation, I've got a series of MP3 files that are being used by my chorus as a learning tool for learning the current music quickly. I have instructions on the site telling them to save the files to their hard drives and to play them from there.

However, people are just clicking on the links and their default MP3 players are trying to play the files. Now, I have compressed the files pretty hard because some were griping about the filesizes, so if they are played right off the link, the quality is a bit choppy. If they save it to their hard drive and play it there, it sounds fine.