Stop stock music app from automatically starting topic

Hey all. I'm stock and unrooted (work phone)... When I hook my phone to my cars Bluetooth, the HTC music app will automatically start playing. I don't have any music saved on my phone so it starts playing downloaded ring tones. How can I stop the music app for starting automatically?

I went into the app settings to disable the app, but it appears that option is disabled.

Thanks all

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