Cellist Mstislav Rostropovich was indisputably a supreme master of his instrument. After leaving Russia in the mid-1970s, he established a distinguished double career as a performer and a conductor in the West. Filmed at Aldeburgh, when he was Festival director there, Rostropovich is seen rehearsing the Pears Britten Orchestra, performing works by Britten and Penderecki, and talking about his eventful life and his music.