Its nice, but I didn't like how "save" means "share". When I logged in with facebook, it told me it wouldn't post to my wall or access my data, so I wasn't expecting it to share my tune under my real name (I wouldn't have clicked save if I'd have known).
When you save a track, there is a little "lock" icon below where you type in the track name. You can use this to mark a track as private. Sorry, that should be more clear.
Ok, I see it now. I suggest a tooltip-style balloon popup that tells users that they can change visibility by clicking the lock. Now that I know about it, though, I'm pretty happy :)
One other suggestion tough, once a track has been saved, there doesn't seem to be a way to change the privacy settings (eg, to make my track private, I basically edited it, deleted the original and resaved - if there is a simpler way, it isn't clear what it is).
Other than that, I like it. I think its still a little simplistic, but its an excellent start and you did say that you have a ton more planned - great work! I'll be looking forward to seeing this progress.
