That a pianist who grew up in Moscow would have an instinctive feel for Prokofiev 's famous ballet is no more surprising than an American grasping Gershwin . But what was exceptional was the way Kissin created a fully formed vision of Juliet girlishly daydreaming yet sexually ripe or of a chaotically charismatic Mercutio . When presenting the Montagues and the Capulets , he evoked not merely a full orchestra but a full stage .