Ask HN: What one piece of music should everyone listen to?

I enjoy listening to new and interesting music, but it can be hard to find stuff that's unique.

Is there one song or one piece of music you think everyone should listen to because of how interesting / unique it is? I'm not necessarily looking for "good", but stuff that's just interesting or different in some way.

It doesn't need to be obscure, but by definition I'm not looking for anything too mainstream.