<p>Over the last three summers conductor Daniel Barenboim and his West-Eastern Divan Orchestra have been performing all nine Beethoven symphonies across the world. </p><p> 　　<p>Formed in 1999, this is no ordinary orchestra. Its members include Israelis and Arabs. The idealism of Beethoven's music makes it the perfect choice of repertoire. </p><p> 　　<p>The three-year tour - called Beethoven for All - finishes this summer at the BBC Proms, in the Royal Albert Hall - the first time in 70 years that all nine symphonies have been played there. </p><p> 　　<p>Two centuries after they were written, Beethoven's nine symphonies are a landmark in western music. Each sets a new challenge to conductor, orchestra and audience. </p><p> 　　<p>In the summer of 2011 the orchestra toured China and South Korea - where all nine symphonies were performed together for the first time. The BBC joined the tour to discover why they are regarded as one of the pinnacles of classical music.</p>