Paul Desmond “Samba Cantina”¶

Ratio of longer to shorter eighth of beats with binary subdivision.

Metrical Centroid

Mean concentration of events in the bar, rounded and normalized to 4/4.

Syncopicity

Share of syncopated notes.

Ambitus

Min/max and range of MIDI pitches.

Extrema ratio

Share of notes with direction reversal (i.e, minima and maxima of pitch contour).

Extended Chordal Diatonic Pitch Class Histogram¶

Extended Chordal Diatonic Pitch Class is calculated in reference to the underlying chord.

Pitch Class Histogram¶

MIDI Pitch Histogram¶

Semitone Interval Histogram¶

Refined Contour Histogram¶

Also known as “fuzzy intervals” or interval classification. See here for definition of classes

Metrical Circle Map (N=48) Histogram¶

Metrical circle maps divides the bar duration into equal sized bins (48 in this case) and maps metrical positions to the corresponding bin. (Labels normalized to 4/4 measure).

Duration Class (Abs. and Rel.) Histogram¶

Relative duration classes are based on the duration of the beat. Absolute duration classes are based on 120 bpm. See here for a definition of classes.

Midlevel Analysis Main Types Histogram¶

Midlevel analysis is a qualitative annotation system of playing ideas, with nine different main categories, as defined in our paper