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Back as early as the time of Pythagoras, music was considered a key to understanding...

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Back as early as the time of Pythagoras, music was considered a key to understanding the universe: musical tones helped explain mathematics and scientific principles, and certain combinations of notes were thought to have profound effects on the emotions.

A.

a key to understanding the universe: musical tones helped explain

B.

key to understand the universe: musical tones will help to explain

C.

a key of understanding the universe: musical tones help explain

D.

key in understanding the universe: musical tones helped explaining

E.

key for helping understand the universe: musical tones helping to explain

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