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Re:Show HN: DJ in the browser by letier on Sunday July 31, 2016 @02:48AM (#12196004)
There was a nice article on the beatport tech blog. I didn't manage to find it when I searched yesterday. Basically what they suggested was applying a low pass filter to isolate the base drums, then count the most common intervals between peaks (basically some kind of transformation) and then reconstruct the BPM from there by applying a range from 80-160 or similar. Hope this gives you a rough idea.

I implemented and tested it and it worked quite well with electronic music.

Re:Show HN: DJ in the browser by coroxout on Sunday July 31, 2016 @05:50AM (#12196292)
Thanks! Was it this one? http://web.archive.org/web/20160304012151/http://tech.beatpo...

(no longer on the beatport site; tech.beatport doesn't seem to exist any more and the current beatport blog starts at 2015)

Re:Show HN: DJ in the browser by musicnrd on Sunday July 31, 2016 @10:16AM (#12197038)
Yeah that's the one, I was looking at this post that uses Spotify and echonest too https://jmperezperez.com/bpm-detection-javascript/
Re:Show HN: DJ in the browser by letier on Sunday July 31, 2016 @06:01AM (#12196310)
Exactly, this one. :)

I wanted to try it with another transformation to see if it can achieve better results.