String Quartet No. 1 (Prokofiev)

Sergei Prokofiev's String Quartet No. 1 in B minor, Op. 50 (1931) was commissioned by the Library of Congress. The Quartet was first performed in Washington, D. C. on 25 April 1931 by the Brosa Quartet and in Moscow on 9 October 1931 by the Roth Quartet. The string quartet is in three movements, lasting around 20–25 minutes.
Analysis.
The work is distinctive in that its key, B minor, is just a semitone below the limits of the viola and cello range. Another distinctive feature is that the finale is a second slow movement, which is highly intense in emotion and full of sweeping melodies.
Prokofiev had liked the finale so much that he transcribed a version of it for string orchestra, as Op. 50a, and included a piano transcription in his pieces as Op. 52.