Dear Musicians and Writers,

how would you see the function of block writing in traditional Jazz, when it comes to the typical parallel motion of four or more voices of close position voicings in a section.

Classical 4 Part writing like Bach´s chorales etc. tend to use contrary motion etc.
What is the basic idea of parallel harmonization of the melody line, where does it come from, why has it developed like this?

Are there any classical parallels

What´d you think?

Thank you
Best regards