Which character is associated with the phrase, "you can play the piano by his heartbeat"?

The phrase "you can play the piano by his heartbeat" is associated with the character Jerome Morrow. Jerome is portrayed as the genetically elite individual who has been engineered to be physically and intellectually superior. His character's abilities and genetic makeup are symbolized through various aspects of his life, including his passions and talents.

This phrase captures the idea of Jerome's extraordinary qualities and precision, suggesting that his heartbeat reflects his emotional and physical state very rhythmically and perfectly, much like music played on a piano. It conveys an image of grace and artistry that is quintessentially linked to Jerome's character, who thrives in a world that values genetic perfection.

The other characters do not embody this same connection to musicality and precision, making Jerome the right association with this particular phrase.