Just like the discover weekly, add like and dislike buttons for songs on the "Daily Mix" playlists.
Simple as that 🙂
Updated on 2020-02-15
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Keep in mind that something similar has already been suggested here: https://community.spotify.com/t5/Live-Ideas/All-Platforms-Return-dislike-button-to-tailor-Radio-and-...
We'd recommend heading over to that idea and adding your +VOTE and feedback there.
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