Create a thread if you want to show anything you've recorded, it doesn't matter if it's just 1 song or if it's 14 songs compiled into an album.
You can add a cover, make your own booklet pictures, or anything you want to make your thread look like an actual release.

Good sites to upload your songs would be:
· Box.net · Streaming site
· YouTube · Video-sharing site
· MediaFire · File-sharing site

Unless it's an original song made by you, don't forget to mention the original artist of the song you've recorded!