I have a new shuttle. I had another shuttle maybe 10 years ago. With the original shuttle my ID was a comcast email with which I am sure I bought songs from the apple store. During the 10 years I have had at least 2 nanos and 2 iphones all of which my ID was changed to an att email name. I now have a new shuttle and an iphone that both use the new att email id. When I use the shuttle and not the iphone the shuttle comes up that I have 40 songs associated with the old comcast email and asks for authorization. I tried responding to this, but apparently I have the wrong password from 10 years ago. When I go through the procedure "forgot" password I am asked for my birthday and when entered I am not recognized. So why is this happening? How can I find what songs are not authorized registered to the comcast id? How can I change these songs to the new id? Why does this not happen with the iphone for the same songs? Thanks.