text: By fifteen years of age , Ma had graduated from Trinity School in New York and appeared as a soloist with the Harvard Radcliffe Orchestra in a performance of the Tchaikovsky Rococo Variations .
simplified: By the time he was fifteen , Ma had graduated from Trinity School in New York and appeared as a soloist with the Harvard Radcliffe Orchestra playing Tchaikovskyâ s ` Variations on a Rococo Theme .