- Time Calculations in Music: http://moz.ac.at/sem/lehre/lib/cdp/cdpr5/html/timechart.htm
- http://joesul.li/van/beat-detection-using-web-audio/
- https://jmperezperez.com/beats-audio-api/
- https://www.npmjs.com/package/web-audio-beat-detector
- https://stackoverflow.com/questions/24724852/pause-and-resume-setinterval