Watch live TV (PVR) and play music (MP3)

I got a question does anybody know a solution for the following problem.

Sometimes i like to watch a football game won’t listen to the TV sound but play a mp3 from mine library.
I watch live TV on the same "box" as i play my mp3's on.
Is the a way/script/plugin to do something like this?

Kind Regards,

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Watch live TV (PVR) and play music (MP3)0
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