How would I also get started with this crate? I want to read a file called audio.mp3 and I want to get beats per minute, pitch/key signature and loudness of the file, would you happen to know exactly how to do this if this is the correct crate I am using?
i had a look at the website i don't think aubio supports key detection (it does support pitch detection); unfortunately i don't know any other library that does this, and i don't think this is an easy problem to solve (see this stackoverflow thread)