Thank you very much @KrisONeil for your answer. It perfectly meets my concerns.
Excuse my insistence and ignorance on the subject. As a consequence of the above, would there not be a software way (Serato, Traktor, VDJ, Engine…) to change the key of the same song from minor to major in real time or viceversa? It may not make sense, but I’m curious.
Thanks, again.