ANSWERS: 3
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STRANGEMUSICTHEORYJARGON
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which piece is it ~ its helpful to know what key a piece is in order to analyze the theory behind the chord progressions.
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He is using the secondary dominant of the IV chord which is GM. This is very common in modulation. The name is using the secondary dominant to modulate. Piano player do this to change keys when they play music that repeats so it won't be so boring to the ear. "Using Secondary Dominants".
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