The Philharmonia Orchestra is a British orchestra based in London. It was founded in 1945 by Walter Legge, a classical music record producer for EMI. Among the conductors who worked with the orchestra in its early years were Richard Strauss, Wilhelm Furtwängler and Arturo Toscanini; of the Philharmonia's younger conductors, the most important to its development was Herbert von Karajan who, though never formally chief conductor, was closely associated with the orchestra in the late 1940s and early 1950s. The Philharmonia became widely regarded as the finest of London's five symphony orchestras in its first two decades.

Otto Nossan Klemperer was a German conductor and composer, originally based in Germany, and then the United States, Hungary and finally, Great Britain. He began his career as an opera conductor, but he was later better known as a conductor of symphonic music.