Such a fascinating read! It reminded me of a yoga class I was in where we all were chanting the mantra - "Sa Ta Na Ma" - while keeping "beat" by tapping our fingers to our thumbs for each word. The teacher has us chant aloud then softly and then only in our heads. When he directed us to speak the mantra aloud once more, we were all exactly on beat! So, maybe in a way, we created our own "click track".