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Root Mean Squared (RMS)
Spectral Centroid
Spectral Rolloff
Spectrogram
Live audio
Ethos - Final Hope
Aphex Twins - Equation
Play song
https://github.com/miguelmota/spectrogram
https://github.com/meyda/meyda
https://github.com/nevosegal/fftjs
https://github.com/vail-systems/node-dct