 Among other teaching activities, he built up a strong tradition of performance at Morley College, where he served as musical director from 1907 until 1924 and pioneered music education for women at St Paul's Girls' School, where he taught from 1905 until his death in 1934.He was the founder of a series of Whitsun music festivals, which ran from 1916 for the remainder of his life.Holst's works were played frequently in the early years of the 20th century, but it was not until the international success of "The Planets" in the years immediately after the First World War that he became a well-known figure.