Piaget became interested in children's development when he . realized that emotions were a large part of growing up properly noticed that the wrong answers kids gave were actually correct listened to their wrong answers during IQ testing noticed that kids were developing without proper support

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.

Iwould say 2: rhythm and repetition