How to delete music from my Iphone 5S if its not showing it in usage?

Okay so for some reason my Iphone's music is there but it is shown as "other". For some reason the music is in the Iphone's memory but I can't play it or when I go to delete it in Usage I can't see it there either. Itunes is not helping at all. Please help! Thank you

Added (1). When I try and delete it off Itunes I can but when I put Sync music manually or automatically so I get the music back, it puts back the space the music that "was" on the phone plus the new same music on the phone I tried and sync. So in the end I still get the old music plus the new sync music and it goes over the phone's usage.

Plug your phone in to your computer and manually remove it in iTunes.

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