A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
Rules
I'm not a scientist by a long shot, but my understanding is that sound if indeed a wave, carried by a medium (air, water, etc). Upon hitting your eardrum, this wave is converted by your eardrum and your auditory nerve into signals your brain decodes. The remainder of the wave continues though, until it runs out of medium, hits an obstacle (basically another medium) or dissipates. Again, just my layman's understanding!
Don’t forget the inverse square law. Even without a change in medium or any obstacles, the strength of the signal decrease over distance until it is undetectable.
This is also why there are no extraterrestrial civilizations hearing any radio broadcasts from Earth. Our transmitters are so weak that any signals we send out fade into the CMB before they get any real distance.
So Lrrr and Ndnd warching Single Female Lawyer 1000 years in the future is a lie?
They would not have been able to watch it from an original OTA broadcast, no.
If we had FTL I'd be a radio archaeologist, flying out to various distances to attempt to capture lost episodes of old TV shows like Doctor Who
You area conflating auditory waves with radio waves.
These are very much not the same thing. Sound waves require a medium while radio waves do not.
Radio waves travel vast distances through space while sound doesn't travel at all.
If they didn't fade with distance, 
So for now we are still quiet in the dark forest.
Oh, and while the king was looking down
The jester stole his thorny crown
The courtroom was adjourned
No verdict was returned
And while Lenin read a book on Marx
A quartet practiced in the park
And we sang dirges in the dark
The day the music died
Let's assume the kid knows it's a recording. It's still a valid question.
Like where is the recording coming from when the kid asks Alexa to play a song?
I never thought about it, as I don't have kids, but must be a bit harder explaining a global IT-infrastructure than it was for my grandpa to explaining how a VHS works. On a generalised level, that is.
The kid made a mistake asking where music came from. Now me must learn about TCP/IP, NTP and DNS 💀💀💀💀
The kid is gonna need naptime and to clear the next 3 years of his schedule. This is gonna get complicated.....
Wowh woah you gotta start with the basics!
...OSI model.
it's sitting on the computer waiting to play again
"how is it now playing here in the car if it's on the computer at home...?"
edit also "a computer at home" feels fairly outdated, when even very young kids have smartphones
As someone with a degree in Philosophy, I don't think this is really a philosophical question. The science is interesting and useful to know
Nothing's really ever gone
Oh, dear child, it goes to the same place where you will go when you inevitably die one day: into complete non-existence, save for an echo in others' minds, and after a while not even that.
Sweet dreams!
syncs brain cells for later
the music goes back again to be later re streamed to other people that might need it
Tell him about the day that music died
Great song 👌👌👌
"Where do you think it goes?"
But actually though, music goes up into the sky and becomes clouds.
In your ears
It goes straight up my ass!
It turns into memories and heat.
To retire on a farm upstate, unless my mom lied to me 🤔
It goes out into the world, to be merged alongside all of the other sounds, until it can be recycled as "new" music and you can enjoy it again:-).
The music stays there we keep moving
It goes on until it doesn’t? Seems like there’s a pseudo-scientific philosophical argument that it continues on forever at some quantum level?
There's a physics argument that information can't be destroyed, so in terms of causality it has an effect (see butterfly effect for reference) but because of various physical thresholds like the planck length, general limits on measurement precision (uncertainty principle, resolution limits, detection limits), chaos theory, etc, at one point it becomes indistinguishable noise.