Thank you. I have one more question.
I have a completed song, is it okay if I chop it up for narrative tension?
(Eg introducing looping bass line first, add looping melody during climax, etc.)
Yes, you can loop specific sections of the song if that's what you mean. If you have separate tracks for each instrument loop, you can still do it, as long as all instrument loops together form a consistent whole (i.e. you don't have separate melodies and mix and match since that would not really be a single song anymore)