Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time. ...

The greatest predictor of musical success is the quality and the quantity of practice time. (Michael Griffin)

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Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.

Michael Griffin Quotes: The greatest predictor of musical success is the quality and the quantity of practice time.