Violinist Amaryn Olmeda, first-prize winner at the 24th annual Sphinx Competition, is a remarkable talent. And at 15, she is no mere hotshot – she plays with nuance and fresh interpretive ideas, investing more into Ravel’s “Tzigane” than just faux-Gypsy showiness. The crowd responded to her every impetuous gesture and flourish, applauding quickly at every pause and then extravagantly at the close.