Ten years ago the city of Mostar in Bosnia-Herzegovina was torn apart by war as ethnic groups destroyed each other. The Mostar Sinfonietta is now bringing them backtogetherthrough its music and attracts performers of international repute to guide them. Virtuoso violinist Ruth Waterman travels to Mostar to encourage the players to even greater heights and discovers through their music that there are no barriers between people at all. producer Angela Hind