"I would like to learn more about melody lines, how they correspond to chord changes."

Oooooh! Now there's a potentially lengthy discussion topic!!

I think it's probably been done already, but if you'd like to go into specifics, why not become a Mudcat member - it's easy, and risk free (unlike MyFace, Twitbook and the like!). Best of all, membership allows you to send and receive 'Personal Messages' in addition to posting to the forum.

Once you've joined, start a thread on the topics you wish to cover, and people will leap out of the woodwork to help you!