txtDefinition=Name given by music historians to a masterful series of six {\uldb string quartets}{\v 154839} by Mozart that were dedicated to {\uldb Haydn}{\v 132423}. Mozart described these works as the \'93fruit of a long and laborious study,\'94 and this study doubtless included the six quartets of Haydn\'92s {\uldb Op}{\v 134155}. 33. Mozart\'92s six quartets are those in G {\uldb major}{\v 86320}, {\uldb K.}{\v 137211} 387; in D {\uldb minor}{\v 88035}, K. 421; in E-{\uldb flat}{\v 82547} major, K. 428; in B-flat major, K. 458; in A major, K. 464; and in C major, K. 465 (the {\uldb \'93Dissonant\'94 Quartet}{\v 210983}).
