For 10 points, identify this British composer who wrote about the  "Bringer of Jollity" and "Bringer of Old Age" in his suite The Planets.
This composer wrote some operas inspired by Hindu myths such as Sita and Savitri. He wrote two suites for military band, a St. Paul's Suite, and A Moorside Suite. He set the poem "I Vow to Thee, My Country" to music in the 4th movement of his most famous piece, the last movement of  which is subtitled "the Mystic" and ends with a fadeout effect, and the first movement has a  distinctive militaristic theme. For 10 points, identify this British composer who wrote about the  "Bringer of Jollity" and "Bringer of Old Age" in his suite The Planets.
This composer wrote some operas inspired by Hindu myths such as Sita and Savitri.
Gustav Theodore Holst