Answer: Ternary Form
Explanation: Ternary Form is a musical form that introduces an idea, (A) then introduces a contrasting idea, (B) then returns back to the original musical idea, often copying the first phrase how it was, maybe including some slight variation in the harmony or rhythm. A good example of a simple piece written in Ternary Form is Mozart's Andante in E-Flat Major.
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It was around 1350-1550 so i would say it is most likely 1450-1600
The concerto was a popular form during the Classical period (roughly 1750-1800). It had three movements – the two fast outer movements and a slow lyrical middle movement. The Classical concerto introduced the cadenza, a brilliant dramatic solo passage where the soloist plays and the orchestra pauses and remains silent.