Just a word of warning. Don't delete tracks from your device! I had it set to display only music stored on device, so assumed that to free space for another, different batch of tunes, I'd just delete the existing ones then build myself a new playlist to sync. What actually happened was I deleted the songs from my music / cloud library. It does say this in the help, but I'd not read that as it seemed sensible to me that it would delete from the device and then I could just resync it later.