i am trying to put music on my iphone and i keep getting the error message that a certain number (about 50%) of the songs cant be put on my iphone because they cant be played on that device. how is this possible? i purchased these songs from itunes (granted it was years ago, but still legally purchased and all) and its very frustrating to end up with less than half of a playlist on my phone because of this. can anyone help me???? thanks in advance!!