playing m4a in browser

Hi,
Thanks to some help from here a few weeks ago, I got my sites up and running out of my house. One of them is for my brother, who wanted me to put up some of his self-recorded songs. On the downloads page of that site,

www.the-optimist.com/music.html

the mp3 links work fine in every browser, but the one test m4a link I put up returns text output only in Safari (Firefox brings a dialog up and I have not yet tested IE).

I did create a .htaccess file in the-optimist.com's document root, which includes the text

AddType audio/mpeg mp3
AddType audio/mp4 m4a

What am I missing ? (yeah, besides the ability to design a website that doesn't look like crap -- I learned enough html to do the basics back in 1996 and I've never moved beyond)

 

I host myself-- an old iMac by my desk running 10.2.8 (Apache 1.3.33).

 

Thanks! that worked. Firefox opens up a player in the browser (right-click will download), and Safari begins a download; either is fine with me. I'll test on a Windows machine when I get a chance, but really I thought this would just be a nice touch for Mac or iTunes users.

Do I still need the .htaccess file I made?

Lastly, a note on nomencalture:what is the proper usage of m4a vs. mp4, at least in my application?

 

Thanks, I have not yet purchased anything from iTMS. Do purchased files use the .mp4 suffix, while the files I import into iTunes (as from my brother's CD) get .m4a?