Classic Radio is a static site. Playback happens in your browser from files on this site. There is no account, no ad network, and no analytics snippet.
The player saves four preferences in local storage on your device: language, volume, shuffle, and repeat. Clearing site data removes them. The service worker may cache the page, stylesheet, script, and playlist so the shell can open when the network is briefly away. Music files are not cached by the service worker.
Track sources and licenses are listed on the credits page and in LICENSE-TRACKS.md in the project repository.