It's only in the original play.
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Does it have to do with Aqua's sister ?
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During Miss Doolittle's six month stay at Professor Higgins' home, she became an accomplished pianist.
The professor attributed it to a superior ear for music, since she could not play the piano when she first arrived and never learned how to read music, but could eventually play anything she had heard. It astonished him she could go to a concert and be able to pick out, and eventually play well, the music of the evening.