When the Falcon Heavy test flight 2nd stage fairing opened at about 115 km, David Bowie started singing "Life on Mars".
Okay, the Tesla Roadster's stereo started playing "Life on Mars", or at least it is said to have done that.
In this comment under this excellent answer I've suggested that a very sensitive microphone could have picked up the sound, that there was indeed sound and that this is an example of music having been played in space.
In order to calculate the sound pressure level, I need at least an approximate density for the ambient atmosphere at 115 km on that day. This requires at least a basic model of the atmosphere and possibly a check on the solar activity on that day because the density depends pressure and temperature, and solar heating affects this, although I am not sure how strong this effect is at such a low altitude. It's extremely important at higher altitudes where drag on satellites in LEO needs to be calculated or estimated.
If you would like to estimate the density boost of a supersonic shock wave, that would be even better, it only makes my comment "more correct" ;-)
The microphone may be more sensitive than a typical commercial product, perhaps using a small laser pickup. But for this question I'm just asking about the density. We can do the sound pressure level and detectability in the subsequent question.
25:25 lower your volume first, there's lots of cheering!