we hang it on a wall of silence in the room of our imagination

All these physics answers! The funnest explanation for a kid is just that music is only there when you're listening to it. If you don't listen, there's no music. When you start listening again, music comes back. Then ask if they can hear the music of the wind.

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:-).

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?

The music stays in your head until your forget it. Music only exists in your head

into our minds and into our hearts

They should show their kid this.

It diverges into the quantum realm of misheard lyrics.

But actually though, music goes up into the sky and becomes clouds.

The music stays there we keep moving

Nothing's really ever gone

syncs brain cells for later