Audio
Sections are defined by large variations in rhythm or timbre, e.g. chorus, verse, bridge, guitar solo, etc. Each section contains its own descriptions of tempo, key, mode, time_signature, and loudness.*
Parameters
The starting point (in seconds) of the section.
The duration (in seconds) of the section.
The confidence, from 0.0 to 1.0, of the reliability of the section’s “designation”.
The overall loudness of the section in decibels (dB). Loudness values are useful for comparing relative loudness of sections within tracks.
The overall estimated tempo of the section in beats per minute (BPM). In musical terminology, tempo is the speed or pace of a given piece and derives directly from the average beat duration.
The confidence, from 0.0 to 1.0, of the reliability of the tempo. Some tracks contain tempo changes or sounds which don’t contain tempo (like pure speech) which would correspond to a low value in this field.
The estimated overall key of the section. The values in this field ranging from 0 to 11 mapping to pitches using standard Pitch Class notation (E.g. 0 = C, 1 = C♯/D♭, 2 = D, and so on). If no key was detected, the value is -1.
The confidence, from 0.0 to 1.0, of the reliability of the key. Songs with many key changes may correspond to low values in this field.
Indicates the modality (major or minor) of a track, the type of scale from which its melodic content is derived. This field will contain a 0 for “minor”, a 1 for “major”, or a -1 for no result. Note that the major key (e.g. C major) could more likely be confused with the minor key at 3 semitones lower (e.g. A minor) as both keys carry the same pitches.
The confidence, from 0.0 to 1.0, of the reliability of the mode.
An estimated overall time signature of a track. The time signature (meter) is a notational convention to specify how many beats are in each bar (or measure). The time signature ranges from 3 to 7 indicating time signatures of “3/4”, to “7/4”.
The confidence, from 0.0 to 1.0, of the reliability of the time_signature. Sections with time signature changes may correspond to low values in this field.