The String Quintet No. 1 in B flat major, K. 174, was written by Wolfgang Amadeus Mozart in December 1773. Like all of Mozart's string quintets, it is a "viola quintet" in that it is scored for string quartet and an extra viola (two violins, two violas and cello).
Mozart composed this quintet a few months following the composition of the Viennese Quartets, K. 168-173 - indeed this work immediately followed that set in the Köchel catalogue.
The work is in standard four movement form:
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