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Table 1 Acoustic features representing musical mood.

From: Query-by-Example Music Information Retrieval by Score-Informed Source Separation and Remixing Technologies

Acoustic intensity features
Dim. Symbol Description
1 Overall intensity
2–8 Intensity of each subband*
Acoustic timbre features
Dim. Symbol Description
9 Spectral centroid
10 Spectral width
11 Spectral rolloff
12 Spectral flux
13–19 Spectral peak of each subband*
20–26 Spectral valley of each subband*
27–33 Spectral contrast of each subband*
  1. *7-band octave filter bank.