Wolfgang Amadeus Mozart's String Quartet No. 15 in D minor, K. 421/417b is the second of his quartets dedicated to Haydn and the only one of the set in a minor key. Though undated in the autograph,[1] it is believed to have been completed in 1783, while his wife Constanze Mozart was in labour with her first child Raimund.[a] Constanze stated that the rising string figures in the second movement corresponded to her cries from the other room.[3]
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