1. On any device, go to developer.spotify.com/dashboard, log in with your Spotify account, and create an app (any name; select "Web API").

2. In the app's settings, add this exact Redirect URI and save:

3. Copy the app's Client ID, paste it below, then tap CONNECT and log in.

Requires Spotify Premium. This device needs internet for the controls to work — they're relayed through Spotify's servers even when songs are downloaded. If the buttons say "no active device", open the Spotify app and press play once, then come back.