Have seen some great Essentials lists that I would like to buy in to. In looking at a few there are dupes of songs that can be purchased from iTunes. So the first question is will I only be billed for one download if I buy the list? If the answer to the above is true, will hold true for other iTunes purchases? The other question is about songs from CD's that I own and loaded in to iTunes. In order to have them in the essentials list would I be required to buy them from iTunes?