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I love the Discover Weekly playlist, it's one of the ways I discover some artists I might never have listened to before, however it could definitely be improved.
There's the option in the Discover Weekly playlist to remove a song that you don't like. I'd love to have an option to mark that an included song/artist was a good recommendation, a simple thumbs up option for both the song and one for the artist, in order to aid the machine learning process to give better recommendations in the future. The song thumbs up option would tell spotify I liked that specific song type/rythym and one for the artist letting spotify know I liked the broader spectrum of the artists overall style.
I'm unsure how the algorithm for discovery works, if it already tracks how many songs you listen to from one of the included artists, how quickly you skip others, whether it's basing the recommendations on similar wavelengths and bpms of songs you've already listened to in your library. With the change from old school adjustable radios to the preset playlists, Discover Weekly is my last vestige on Spotify to find new music and would love to see this feature expanded and become smarter, or to be more involved with the process!