Music app doubles in size when dragged from iOS dock
So I rearranged my iPhone apps and put a folder in the dock called "Listen" which has all my music apps in it.
I noticed when I dragged Music out of the dock and put it in that folder, so I could then drag the folder back into the dock - the space usage at the bottom of the iTunes interface added several gigs of data, putting me far over the available space. I think it was roughly the size of the Music folder, so in effect it doubled the space usage.
On a whim, I hit sync anyway - thinking it was just a glitch - and the result was that all the songs I was syncing failed to sync - not enough space available.
But guess what? I opened music on the phone and there they all were.
But iTunes continues to tell me the phone is over capacity. So I tried turning off "Sync Music" entirely. Then all the Audio disappeared in the space usage graph, and sync worked fine.
Guess what? Music still opens up with all my music on there, from before the Sync.
OK - so now I've got a phantom music library on my phone, and I can no longer change what is on there... unless what, a Factory Reset?
I'd rather just get Music to snap out of it, or iTunes or whatever is the culprit. And stay with the nice changes I made to my App arrangement in that last proper Sync.
Thanks for any help or suggestions in advance...
iPhone 4S, iOS 8.4.1