Music has the power to transcend differences, crossing borders, time and space. Here are four composers who have blended folk elements and the music of different cultures into their work. Mozart looked to the stories of Egypt, Haydn’s travels expanded his trademark blend of grandeur, humor and charm, Kodály embraced the folk music of Eastern Europe in his rapturous Summer Evening, and Ravi Shankar has synthesized classical and folk Indian music with Western forms, handing these traditions from father to daughter in a work written especially for his daughter Anoushka.