Audibility of Sound at Mach 2: Inside the Car

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At Mach 2, the driver of a car would not hear external sounds due to the high speed, but the stereo system inside the car would still function normally. Sound travels within the car's stationary air, allowing the driver to hear the music regardless of the car's speed. The key factor is that the sound produced by the stereo is not affected by the external environment. Therefore, the driver can enjoy the stereo while traveling at such high speeds. The internal acoustics remain consistent, enabling normal sound perception.
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I'm stumped... If there exists a car that can be driven at the speed of Mach 2, will the driver still be able to hear the stereo? What are the reasons for the answer? I know that Mach 2 is twice the speed of sound, so it's unlikely that a driver would hear the sounds outside the car. However, the stereo is inside. Does it matter what speed the car is driven at if the sound is produced from the inside?
 
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The air inside the car is stationary with respect to both the speakers and the listener, and thus sound travels as usual inside the car.

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