The Royal Philharmonic Orchestra (RPO) is a British orchestra based in London. It tours widely, and is sometimes referred to as "The Nation's Favourite Orchestra". The British Hit Singles & Albums noted that it was "formed in 1946 by Sir Thomas Beecham, who wanted a first rate ensemble that would attract the country's top musicians." Since his death, it has come under various music maestros including André Previn and Louis Clark (who was behind its biggest sellers).