With SoundCloud API you can build applications that will give more power to control your content.
SoundCloud API is a free Music API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from developers.soundcloud.com.

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