There is a great good quality tool online that lets you separate music files to instruments. I tried other ones before, they did a bad job, this one is very good however. Of course, quality comes with subscription only, you need to pay for it. By accident, I found a hack to be able to use it free. Anyone interested? If yes, let me know and I put a description here.

What's the name of it

https://www.lalal.ai/

I found that one the most effective, but it doesn't let you download without subscription. I found a method to solve that.

I’ve been using lalal.ai for years now. It does an almost perfect job.