NatureVision simply puts beautiful pictures to soothing music. It's also a little reminiscent of "Soylent Green" where people get to spend their last hours viewing beautiful pictures of a long-lost nature. Kinda weird, but nice.
You can find NatureVision TV on some airplanes, on Sling TV, on Roku, Apple TV, Amazon Fire TV, Android TV, Netflix, Amazon Prime and others.
Here's a preview: