Editing Choir (section)

===Medieval music===
{{Main|Medieval music}}
[[File:54-aspetti di vita quotidiana, canto in chiesa,Taccuino Sani.jpg|thumb|Church singing, ''[[Tacuinum Sanitatis]] Casanatensis'' (14th century)]]
{{unreferenced section|date=July 2020}}
The earliest notated music of western Europe is [[Gregorian chant]], along with a few other types of chant which were later subsumed (or sometimes suppressed) by the Catholic Church. This tradition of unison choir singing lasted from sometime between the times of [[St. Ambrose]] (4th century) and [[Gregory the Great]] (6th century) up to the present. During the later Middle Ages, a new type of singing involving multiple melodic parts, called [[organum]], became predominant for certain functions, but initially this [[polyphony]] was only sung by soloists. Further developments of this technique included [[Clausula (music)|clausula]]e, [[conductus]] and the [[motet]] (most notably the [[isorhythm]]ic motet), which, unlike the [[Renaissance music|Renaissance]] motet, describes a composition with different texts sung simultaneously in different voices. The first evidence of polyphony with more than one singer per part comes in the [[Old Hall Manuscript]] (1420, though containing music from the late 14th century), in which there are apparent ''divisi'', one part dividing into two simultaneously sounding notes.