Vulfpeck's Sleepify album. The tracks were silent so you could play them in the background. They used the proceeds to fund a free tour for their fans.

That cuts to how much of a mess spotify payouts are in general, where the subscription revenue pool is paid out based on global listens, and the people with fewer hours of use don't control which artists get most of their money. But as far as I'm aware the big labels don't like the idea of changing that.

iirc it was a blank track so literally no sound and it was supposed to be for founding a tour