I just found this online AI-service tool for extracting instruments from an audio file.

LALALAI
https://www.lalal.ai/

I have only played around with the free version extracting out various instruments drums, bass etc.
I am impressed, I have tried several ways to extract drums from mp3 before e.g. various EQs,inversion, Drum Remover plug ins but nothing have produced anything useful at all.

This AI tool could be of help for a user when analysing a song arrangement trying to hear the various instruments in an existing arrangement.

It is very simple to use just select which instrument to separate and drop the the mp3 file in the browser. The free version does only give a sample of the song and it is only for listening no file produced. (But it is quite easy to record what is played back on the PC eg with Audacity with the interface set to loopback what is played in the speakers and record it (Windows WASAPI)).