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Deezer API is a free Music API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from developers.deezer.com.

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The Deezer API is provided by Deezer for developers (developers.deezer.com).
Yes. The Deezer 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 Deezer API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Deezer API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Deezer API is served over HTTPS, so it's safe to use in production.