Apple Music Understanding

developer.apple.com · checked 14 Nov 2026

#11 · AI Song Analyzers

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How it plugs in

—Public API

NoOpen source

NoFree tier

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Music Understanding is an Apple framework for analyzing audio and extracting musical information.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: developer.apple.com
Price: Not published
Free trial: Not stated
Analysis dimensions: It analyzes key, rhythm, structure, pace, instrument activity, and loudness.
Export: Session results can be encoded as JSON.
File input limit: Asset-based sessions require locally available media or a complete file.
Incremental delivery: The framework offers a streaming API that delivers loudness values every 100 milliseconds of analyzed audio.
Instrument activity: Instrument activity results can indicate instrument presence and activity intensity over time.
Loudness output: Loudness results include integrated, momentary, short-term, and peak measurements.
On-device and offline: The framework runs on-device and works offline; Apple says analyzed audio stays private.
Rhythm output: Rhythm results include beat and bar timestamps and an optional global tempo in BPM.
Selective analysis: Apps can request only selected analysis types to avoid unnecessary computations.
Session input: A session can use an AVAsset or a custom audio provider.
Streaming input: A custom audio provider yields AVReadOnlyAudioPCMBuffer objects through an AsyncSequence.
Structure output: Structure analysis returns time ranges for sections, segments, and phrases.

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