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music-beat-detector
music-beat-detector is a library that analyzes a music stream and detects any beat. It can be used to control lights or any magic effect by the music wave.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
My first response would be that there is almost certainly literature on this. A quick look found several papers across the field of medicine, where beat detection in signals can be important, as well as directly from music. I also found some code on Github that may well be helpful: https://github.com/chrvadala/music-beat-detector -- that was just the first thing I found; I'm sure that there are many others.