That's probably a bit of custom work. I could do it but . . .if you're looking for free, try this:
Put the music you want on your headphones and then sing along and record your own singing.
Use a free audio editor (try download.com) to put your voice on one track and the music on the other.
I'd need to know more about your 'borris skulls' to suggest more. Do they have a seperate audio input or do they react to sound?
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