The Hooktheory API exposes music chord probability data used in TheoryTab Library searches, which enables users to find the most popular chord progressions in music. All requests are made over HTTPS, with request and response support for JSON and XML formats. To authenticate to the Hooktheory API, you will need to provide a bearer Token, that follows the OAuth 2 protocol. Hooktheory provides developers with support for the theory behind songs using music theory books, songwriting software, and TheoryTabs.
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