Music of the Spheres (Danish: Sfærernes Musik) is a composition by Rued Langgaard, written in 1916–18 and scored for orchestra, choir, organ, a "distant" orchestra, and a soprano soloist.
The work incorporates radical innovations, considered ahead of their time, including some of the earliest examples of string piano (playing directly on the strings of the piano), and Langgaard's extensive use of slow moving string clusters prompted the composer György Ligeti to proclaim himself a "Langgaard-epigone" when presented with the score in the late 1960s.
According to the music researcher Eric Christensen – in an analysis of works utilizing the "spatial dimension" as a fundamental concept – the space of Music of the Spheres is limited at the upper level by repeated lines of high notes on the violins and flutes, and at the lower level by timpani and deep horns. In between it is filled out with clusters and polyphonic tonal surfaces that remove the sense of time moving forward. Instead, it makes time "acutely present" by accelerating repetitive patterns. The form of the work is accumulative and concludes with a vision of "the end of all things" expressed with stark musical contrast, such as violent music followed by noisy "anti-music" (produced by cymbals and kettle-drums) juxtaposed with "heavenly" music with angel choirs and the sound of harps.
Music of the Spheres received its premiere performance on 26 November 1921 in the Konzerthaus, Karlsruhe, Germany, with Ellen Overgaard (soprano), Badisches Landestheater-Orchester and Choir, conducted by Hans Seeber-van der Floe. The premiere was a success, but the following year it received a more lukewarm reception when performed in Berlin, and it was not performed again until 1968, where a performance in with the , conducted by Sergiu Comissiona, ignited a renaissance for Langgaard's music.
The first performance in Denmark took place in 1969 in "Rundhøjhallen" in Holme with Aarhus Symphony Orchestra and Choir, conducted by Per Dreier. Unfortunately the soprano soloist, Margrethe Danielsen, did not make it in time for the concert. In 1971, a reduced version was performed in Copenhagen, but the first complete performance in Denmark, all forces present, took place in 1980 in the concert hall of Radiohuset with Edith Guillaume (soprano), and the Danish National Symphony Orchestra and Choir, conducted by John Frandsen.