Old iTunes library is somehow synced to my Galaxy S5 and cannot be deleted

11 GB of device storage are being used up by songs and podcasts I had stored in iTunes over 15 years ago. I've never installed iTunes on my Android device nor on the laptop that I've connected this phone to. When I go to the 'Storage' settings on my device, select these files and then select delete, it always comes up with the message, 'Failed to delete'. I'm at a loss as to how these files appeared on my phone. I even installed iTunes on my laptop today to see if I could delete these files from my iTunes library but they're no longer there. But they are somehow on my phone.

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