How do you subscribe to an Mp3?
You don't actually subscribe to an Mp3. You subscribe to the Mp3s a user or band adds to their profile. On their main profile page, the user will have a section for their Mp3s. In the upper right corner of that section, there will be a line that says: Subscribe. Click it, then click on the confirmation that you do want to subscribe. After that, any time that user adds a new Mp3, you'll be notified.