Radio Browser
List of internet radio stations
Music Events.
Songkick API is a free Music API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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List of internet radio stations
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Yes. The Songkick API is listed in the Music category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Songkick API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Songkick API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Songkick API is served over HTTPS, so it's safe to use in production.