navigate to Project Groups to start a project. State what you wish to achieve and what kind of collaborators you want.
First navigate to Create Content
You will see a list of things that you can create.
Next navigate to Audio
You can assign your audio files to a 'Project Group' if one exists.
Finally, you should consider what kind of Creative Commons License you are going to choose for your project.
Make sure that you choose a file that is within the size limit - 8MB (this should ideally be a compressed file format such as mp3 or ogg)
Please ensure that your song is your own original work and not a cover song.
What next?
Wait for another member to apply for your group (or to check it out if it is on 'Track'n'Stack'), you can then start your own forum to discuss the project, a music blog (M-BLOG) as a diary and a Home Page for your group.
If you have a successful collaboration, you might want to talk about sharing the original wave files (they are too big to be shared through this site, but you might be able to use email attachments, or www.yousendit.com)