Which composer's 'The Planets' suite includes a movement for Neptune?

The composer whose suite The Planets includes a movement for Neptune is Gustav Holst. The seven-movement orchestral suite was written between 1914 and 1917, with each movement portraying a planet’s astrological character rather than describing its scientific properties.

Neptune is the suite’s final movement, titled “Neptune, the Mystic.” Its floating harmonies, subdued orchestration, and distant-sounding wordless female chorus create an otherworldly atmosphere. The chorus gradually fades away at the end, making the movement seem to dissolve into silence.

Holst did not include Earth or Pluto. Pluto had not yet been discovered when he composed the suite, and Holst was interested primarily in the symbolic influence associated with the planets. The work is also commonly misremembered as an astronomical catalogue, but its sequence and moods come from astrology. Mars opens the suite, while Neptune closes it, completing Holst’s seven-part musical journey.