Spotify is testing out a tool that will let artists and labels give specific tracks increased exposure in the service's recommendation algorithms, in exchange for lower royalty payment on those streams. Describing the new feature in a post on their blog, Spotify writes:
In this new experiment, artists and labels can identify music that’s a priority for them, and our system will add that signal to the algorithm that determines personalized listening sessions. This allows our algorithms to account for what’s important to the artist—perhaps a song they’re particularly excited about, an album anniversary they’re celebrating, a viral cultural moment they’re experiencing, or other factors they care about.
To ensure the tool is accessible to artists at any stage of their careers, it won’t require any upfront budget. Instead, labels or rights holders agree to be paid a promotional recording royalty rate for streams in personalized listening sessions where we provided this service.