You'll need to find a website to host it. It's kind of complicated. You can do it yourself using Yahoo! Geocities.
Here are some instructions:
Find the Music on your computer.
After finding it, it would be smart to either remember the location or save it to a general locaton like the desktop.
Create a Geocities account by going to
http://www.geocities.com , and signing up for the free service. If you have an already existing Yahoo! account you could use that to sign in.
After either signing in or creating a new account, upload the file. To do that, launch the page builder and click on Add-ons (I think) up at the top, and click on Upload File. Find the file, and then upload it...
After doing that, set it as backround Music. Go to Add On's again, click on Background Music, and type in the file name. If the Music was named Music.mp3 , you'd type that in.
Then you'll need to get the link for it... if you made your geocities account as user, and the music was uploaded as music.mp3 , then the link SHOULD be
http://www.geocities.com/user/music.mp3 .... you'd paste that in your MySpace page.
I know it's kind of complicated, there may be an easier way to do it... Maybe someone else knows.
If you need more help doing it that way though, feel free to contact me.. all my info is in my profile, or just reply here
otherwise, i could probably host it on my website if the file isn't too big.. let me know if you want that.