If you want to listen to your iTunes music collection on your phone, but aren’t ready to fully-online with Google Play, iSyncr can help. Install the companion desktop app, and then use the Android app to transfer your library, either over USB or Wi-Fi. The desktop software is fairly light–it’s just a syncing tool, not a full-blown iTunes replacement–and supports some advanced features such as album art, syncing of multiple iTunes libraries and the ability to transfer playlists created on the phone back to the computer.
Link: iSyncr for iTunes PC version, Mac version ($3.99)