Hi, I was wondering if anyone knowledgeable on the subject, could answer the following:
When composing polytonal music, do both keys have to be established in the same way? I understand the ultimate goal, is the V pillar to the I pillar, however leading up to that point, say one key is established through a
iii-vi-ii-V-I progression, would the other key have to progress in the same way, at the same time? In other words: do one of the pillars have to be present, at all time?
Thank you