For the longest time, the Amazon Music app was not on Apple TV. People have other choices, but Amazon Music is worth having. It’s got loads of music, with subscriptions only costing $7.99.
Anyway, people who have an Apple TV will soon have the App. Right now, the App is already on the 4K model and the standard HD Apple TV. As long as the television has tvOS 12.0 or later, it should be there.
Today, the App is already available in US, UK, Australia, New Zealand, Brazil, Canada, France, Italy, Spain, Germany, Mexico, Japan, and India. It should eventually roll out to more areas.
Source: The Verge