I know you can upload video files, but nothing just au
dio.
I've tried with fileswap.com, but some of my contacts are not able to open the link.

Any advices?

*tis just because I've recorded myself singing and I really want everyone on my friends list to listen to it for critiques and what not. c:

Here, so you can critique too:
http://www.fileswap.com/dl/ao4EZhAR5f/heaven_-_3.wma.html