Horoscope is a ballet created in 1937 by Frederick Ashton with scenery by Sophie Fedorovitch and music by Constant Lambert. It is based on astrological themes, and is reminiscent of Gustav Holst's The Planets in its musical exploration of the mystical. The story of the ballet concerns a young man and woman who were born in the disjoint Sun signs of Leo and Virgo. However, both have their Moon in Gemini, and they are able to overcome their fate and become lovers.
It had its first performance by the Vic-Wells Ballet at Sadler's Wells Theatre on 27 January 1938, starring Margot Fonteyn and Michael Somes, and it made stars of both principal dancers, but particularly Michael Somes, who was described by one critic as potentially the finest British male dancer of the half century. At that time Constant Lambert was conducting an affair with the young Margot Fonteyn, but they later separated. The ballet has been described as a symbolic representation of this affair. Other roles were danced by Richard Ellis and Alan Carter (the Gemini), and Pamela May (the Moon).
The ballet was praised by the critics: Francis Toye called it ... perhaps the most successful modern ballet that has been produced at this theatre for a long time. Arnold Haskell wrote: With Horoscope, ballet, now truly indigenous in England, readies a splendid maturity. 
Horoscope was to be Lambert's last original work for 14 years, during which time he concentrated on conducting and touring.
The full score was lost in the Netherlands, only nine numbers surviving. The Vic-Wells Ballet was touring there in 1940 when German forces occupied the country, and they had to escape hurriedly, leaving behind scenery, costumes, and the full scores to both Horoscope and The Wise Virgins (an arrangement of Bach's music by William Walton). The work had had only 29 performances and was never revived.
The nine surviving numbers are:
- "Palindromic Prelude" (Lambert claimed that the theme (which, as the name implies, can be played in either direction) was dictated to him by the ghost of Bernard van Dieren, who had died in 1936.)
- "Dance for the Followers of Leo"
- "Saraband for the Followers of Virgo"
- "Man's Variation"
- "Woman's Variation"
- "Valse for the Gemini"
- "Pas de Deux"
- "Invocation to the Moon and Finale".
For many years, the music for Horoscope was known only in the form of an abridged concert suite of five numbers that contained, according to contemporary commentators, the best of the music. Lambert himself recorded three of the movements ("Dance for the Followers of Leo", "Valse for the Gemini" and the "Invocation to the Moon and Finale") in 1945, with the Liverpool Philharmonic Orchestra. That was the first recording of any of the music from the ballet. In 1949, Lambert recorded two more numbers, "Saraband for the Followers of Virgo" and "Bacchanale", with the Philharmonia Orchestra. The five-movement Horoscope Suite was later recorded by the London Symphony Orchestra under Robert Irving (1953) and the English Northern Philharmonia under David Lloyd-Jones (1990).
- Frederick Ashton and His Ballets
- HD Tracks
- Bruce R. Schuenemann et al, Minor ballet composers
- New York Times. 2 May 1999
- Ballet magazine, 1938
- Telegraph: Pamela May obituary, 8 June 2005
- An Exhibition
- Music Web International
- Records International Catalogue
- The Independent, 21 August 2001
- Gramophone, July 1945
- Gramophone, June 1949
- CD Universe
- Hyperion Records
- Guardian, 13 August 2004