Musi allows you to listen to any song (video) from YouTube without being interrupted with ads like with Spotify. As someone who doesn't have a music streaming subscription I prefer to use Spotify on Desktop and Musi on mobile, so I created this app to transfer songs between the two.
- Navigate to https://developer.spotify.com/dashboard

- Create an app with the name & description of your choice.
Make sure the callback URL is set to http://localhost:5000/callback/spotify

- Open Settings

- View Client ID and Client Secret and store them in a safe place.

- Initialize setup script with
spotify-to-musi setup& enter Client ID and Client Secret

- Open the link (http://localhost:5000/callback/spotify) in your browser and authorize with Spotify

- Return to your terminal, and you should be successfully authorized! :3

If you're running pycharm, make sure emulate terminal in output console is enabled
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