Chroma Toolbox: Pitch, Chroma, CENS, CRP: "Chroma-based audio features have turned out to be a powerful tool for various analysis tasks in Music Information Retrieval including task such as chord labeling, music summarization, structure analysis, music synchronization and audio alignment. A 12-dimensional chroma feature encodes the short-time energy distribution of the underlying music signals over the twelve chroma bands, which correspond to the twelve traditional pitch classes of the equal-tempered scale encoded by the attributes C,C#,D,D#,...,B. Such features strongly correlate to the harmonic progression of the music signal, often prominent in Western music. By identifying spectral components that differ by a musical octave, chroma features possess a significant degree of robustness to changes in timbre and instrumentation."
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