Quartet No. 52 in E♭ major, Op. 64, No. 6, FHE No. 36, Hoboken No. III:64 is part of Joseph Haydn's string quartets, Op. 64, a set of six string quartets composed in 1790. They are known as the Tost quartets, after the Hungarian violinist and later merchant Johann Tost who helped Haydn find a publisher for the works. Unlike the earlier quartets, Haydn actually dedicated the Op. 64 set to Tost in gratitude for his efforts.
