In March 1913, Holst became good friends with Clifford Bax, who was an astrologer. He introduced Holst to the concept of astrology, and from there also became quite interested in theosophy (religious philosophy about the nature of the soul based on mystical insight into the nature of God). From there, in 1914, Holst began to craft a seven-movement suite with movements entitled Mars, the Bringer of War, Venus, the Bringer of Peace, Mercury, the Winged Messenger, Jupiter, the Bringer of Jollity, Saturn, to Bringer of Old Age, Uranus, the Magician, Neptune, the Mystic. Pluto was not discovered until 1930. The Planets as a whole displays Holst’s compositional strengths and influences. His fourth Movement, Jupiter, Bringer of Jollity, offers three memorable themes, including the rich and soaring hymn-like section featured in Ms. Monday’s arrangement.