I'm trying to wrap my head around shock waves produced by bullets and their properties. In particular I'm interested in what affects the duration of the shock wave in time. Say someone shoots at me, the bullet passes near me, and I hear the shock wave produced by the bullet. If you look at the air pressure over time where I observe the shock wave, what might it look like, and how long in time does it last? Does this depend on the shape of the bullet? its speed? what else? I've tried to research this question but almost all the information I can find describes the wave front of the shock wave, mainly its shape, but nothing about what happens right behind the wave front. Another scenario which I can't seem to come up with an answer to. If a bullet was singing a song, starting right when it leaves the gun, what am I going to hear as the bullet flies by me?