A: Historically, it appears and disappears due to licensing. As of this writing, it is often region-locked. A download (purchased) ensures you never lose it.
This scarcity is a primary driver for the high volume of search traffic around the keyword. Fans want the "Show Source" audio—the exact track played over the PA system, complete with the narration by Jiminey Cricket (or later, the un-narrated version) and the specific sound design elements that trigger the fireworks. illuminations reflections of earth soundtrack download
If you have tried to find an official album simply titled "IllumiNations: Reflections of Earth" on iTunes or Spotify, you have likely run into a wall. For years, Disney was notoriously sparing with its park music releases. A: Historically, it appears and disappears due to licensing