Gustav Holst
His most famous work of all is The Planets (1918). This is a suite of seven movements for orchestra, each about a different planet (the Earth is not included, and Pluto had not yet been discovered). The music does not really describe the planets, it describes the Roman gods after which the planets are named.  Mars, for example, is the “Bringer of War”. It has a very exciting rhythm with five beats in a bar. Jupiter has a tune which has become famous as the hymn “I Vow to Thee, My Country”. He died of heart failure in London.