Spotify needs to license https://mynoise.net and include their dozens of soundscapes into the Spotify client.

The captured audio soundscapes are high quality, engineered, mixable audio from many relaxing and peaceful natural and artificial environments.

Tossing a few million dollars towards the MyNoise people for something that's currently donor-ware would be amazing for the creators as well as opening up the ambient soundscapes to millions of people.

Spotify gets royalty-free audio that takes up very little bandwidth.