You can add a biography on Spotify via Spofity for Artists (previously Spotify Fan Insights), the 'dashboard' for artists that gives you insight into statistics for your releases.
You sign up for Spotify for Artists Through this link. Since the access is linked to a personal Spotify account, we cannot arrange this registration for you.
A Spotify biography can have a maximum of 1500 characters. It is possible to add a link to a Wikipedia page in your bio.
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