Is 4'33" out of copyright now?
I'm not even kidding, it exists.
https://www.theguardian.com/music/2010/dec/06/cage-against-m...
I bought a copy of 4'33" on iTunes when I got my iPhone 3GS in 2010 to deal with this auto-play issue in my car. It worked well, and I suspect if more people were familiar with that composition before the release of this new track, 4'33" would have received more sales.