The Planets Op. 32 is a seven-movement orchestral musical series by the British composer Gustav Holst, written between 1914 and 1916. The first complete public performance happened during World War I on 10 October 1918 in Birmingham, with Appleby Matthews directing the orchestra. However, an earlier premiere for only a small group of people was held on 29 September 1918 in the Queen's Hall in London, with the orchestra directed by Adrian Boult.