What is the name of the black & white movie where a kid grows up to become a famous

composer? The kid's dad buys a piano for him and his brother when he is a child and he is instantly able to play it and he grows up to become a great composer. At one point in the movie his father asks him how long his music piece is and he says "6 minutes" and the father says something along the lines of "6 minutes, it is sure to be a grand piece of music).
 
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