String Quartet in D minor (Sibelius)

String Quartet in D minor
Voces intimae
by Jean Sibelius
The composer in 1913
Opus56
Composed1908 (1908)–1909
PublisherLienau (1909)
Duration28 mins.
Movements5
Premiere
Date25 April 1910 (1910-04-25)
LocationHelsinki, Finland
Performers
  • Viktor Nováček (violin I)
  • Sulo Hurstinen (violin II)
  • Carl Lindelöf (viola)
  • Bror Persfelt (cello)

The String Quartet in D minor, Voces intimae (literal English translation: "Intimate voices" or "Inner voices"), Op. 56, is a five-movement chamber piece for two violins, viola, and cello written in 1909 by the Finnish composer Jean Sibelius. It is the only major work for string quartet of his mature period.