You should try posting your mp3 on this site. Here's why:
Many Guitars101 brothers and sisters don't like being redirected to a place that requires another signup or registration; they just move on and your tune falls on deaf ears.
Some of them don't mind going to Soundclick or whatever and DO listen to your tune, but might not bother clicking back to the original thread to post a comment. C'mon, we all enjoy reading feedback on our proud work.
Lastly, linking your music to a remote site dilutes the strengh of Guitars 101 and strays away from what we are trying to maintain: a cohesive Guitars101 community...