I am almost positive the answer is light, but let me know if that is wrong
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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