organum

Bacon never uses the word in its modern meaning in English in print, and he uses factum three or perhaps four times in print, but the crucial text, the Novum organum of 1620, was not translated into English in time to have any influence.

The trailblazer of this group was called Leonin, and by the standards of the early twelfth century he was both prolific and admired, regularly combining plainsong chant melodies with a second voice, a technique now known as organum duplum.

Organum became very popular across Europe - and, dare I say it, formulaic to the point of tedium.

But the heady excitement of turning one tune into two at no extra cost had another spin-off: organum where one voice stood still instead.

If we imagine parallel organum as a train track winding across the landscape, the drone style looked more like a graph in which one line moves and the other stays constant.