How many half notes can fit in a measurement with a time square of 4/4

Organum was first developed by religious singers adding another melody directly above the chant and mirroring the chant line. true false

In areas where even the experts disagree; everyone has a right to his own opinion. i mean if answers aren’t given just like in lots of things; then it has to be just anyone’s opinion. is this dualism multiplicity relativism or commitment

What are possible sources a hair designer might use for inspirations