Music that isn't music!

[WPCentral Question]

Nokia Lumia 520, WP 8.1. Phones says I have 72 songs in my music collection but they all have cryptic names like Beep16K (allegedly from LastFM), RTBM 11_22 2.0 (supposedly from HBO) and others which I cannot delete or play. I see these files when using the Windows 8.1 PC app "Windows Phone App for Desktop". When I try to delete them, WPAD says it can't find them.

Where is all this stuff coming from and how do I get them off?

Thanks,
Nick
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