Who was the English conductor and Director of Music for the British Broadcasting Corporation, who first performed Ralph Vaughan William's Symphony No. 6?
Symphony No. 6 (Vaughan Williams): Ralph Vaughan Williams's Symphony in E minor, published as Symphony No. 6, was composed in 1946–47, during and immediately after World War II. Symphony No. 6 (Vaughan Williams):  Dedicated to Michael Mullinar, it was first performed by Sir Adrian Boult and the BBC Symphony Orchestra on 21 April 1948. Adrian Boult:  When the British Broadcasting Corporation appointed him director of music in 1930, he established the BBC Symphony Orchestra and became its chief conductor.
i don't know