Am 14.10.19 um 10:36 schrieb Louigi Verona:
  What are the bpm and key detection libraries people
use for open source
 projects? And how good are they? 
I use these command line tools: 
http://www.pogo.org.uk/~mark/bpm-tools/
Only needed it a couple of times but worked well then, even with non-EDM
music, im my case Irish Folk.
The AUR package for this has a minor patch for the bpm-tag script:
https://aur.archlinux.org/packages/bpm-tools
Chris