Decomposing a tune

I am new to Audacity and learning how to use it. So please bear with me as the question may be stupid
Most music is composed from different instruments been played to form a tune .For example base , lead ,rhythm guitarist, drums and a vocalist and may have other instruments. So if I have a tune "how do I decompose it into individual sounds i.e just the drums, a separate vocalist sound etc
Is there a procedure or commands that I can use to achieve my goal, If I combined/impose them together the sound will be the original tune.
Many Thanks and look forward to hearing from you.

Need something like spleeter … [not Audacity].