Sharon - I suggest you hang about until somebody who knows all about the answers to your questions shows up. I am aware that a number of Mudcatters have used CD Baby to distribute their recordings. Not that long ago Bobert had a thread advertising his CD which was being distributed through them.
Questions of copyright and permissions to use tunes or songs have also been discussed within the forum. A forum search (Lyrics & Knowledge Search - box at top of page) using keywords such as copyright may pull up old threads of interest to you.
If you do not know the origin/compser/date of a specific tune, Mudcatters are very good at finding such information. Ask in a separate thread with the tune name clearly included.
Best of luck.
Quack!
Geoff the Duck.