I have songs on my iPad that I did not download/purchase

On my iPad the only music that I have synced from by iTunes library is one playlist. But, I have recently noticed that there are songs on my iPad that I never downloaded/purchased. They definitely are not in that playlist, nor are they in my iTunes library.



How did they get there, and how do I get rid of them? Can't seem to delete them directly on the iPad.



Thanks.

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