I thought that this app is interesting in part because while it does provide utility as background music, it is also a channel to help drive monetization of the composer's music.

The app is free but it requires an existing Apple Music or Spotify account.

Maker of app here. Thanks for posting! That's precisely one of the goals.

SLEEP is a massive musical landscape and there is so much to explore. I hope this app will allow me to hear more of SLEEP while they meditate, focus or ... sleep.