I know this is a dumb question but I can't new music from iTunes onto my phone. The phone is plugged into my laptop and iTunes is open. I just purchased new music and want to add it to my existing music on my phone but if I drag the check marked song over nothing happens and if I uncheck it it has the circle with the line thru it when I drag..if I click on music under my phone it shows the music in a grayed out window........how do I get my new music onto the phone?