My understanding is, he learned to play the piano for "The competition" so that when he was filmed it would appear that he was playing, but another pianist actually played the piece.
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The piece of music I assume you are enquiring about is in Pretty Woman (late at night in the hotel). This was written and performed by Richard Gere himself. In the movie credits (and all over the internet for that matter) it is only referred to as Richard Gere's piano solo.
Lady Sings The Blues.
* Richard Clayderman * Stevie Wonder
A piano.
GUITAR AND PIANO...