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  It was around this time when a new method to teach singing was invented by a monk and choirmaster named Guido de Arezzo.
 He was born
 (important composers)
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  The Notre Dame school of polyphony was the center of activity. Rhythmic notation first appeared in this period. Also known as the ars antiqua; it is during this time when the motet initially developed.
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  Léonin is born
 (important composers)
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  perotin is born
 (important composers)
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  Phillipe de vitry is born
 (important composers)
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  Guillaume de Machaut is born
 (important composers)
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  starts the development of the gregorian chant
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  The development of organum, an early form of counterpoint.
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