I recently purchased a new computer and set up a new iTunes account on it. In an attempt to retrieve the music from my old iTunes library, I logged into with my sister's Apple ID to the iTunes store on my iPhone and transfered all purchases to my device. In doing this, the music from my new Apple ID was unable to play and I got a message stating, "This Device Is Already Associated With an Apple ID" along with some information on how you can only download past purchases on a device with one Apple ID every 90 days. So I plugged my phone into my computer and synced it to my new iTunes library and now it seems that all of my music is unable to play. Is there any way I can fix this? Or will I have to wait another 90 days before I can listen to music on my phone again.