The String Quartet No. 6 in F minor, Op. 80 was composed by Felix Mendelssohn in 1847. It was the last major piece he completed before he died two months later on 4 November 1847. He composed the piece as an homage to his sister Fanny who had died on 14 May of that year and it bore the title "Requiem for Fanny."
The quartet was first heard in private on 5 October 1847 in the presence of Ignaz Moscheles. The first public performance was on 4 November 1848 in Leipzig with Joseph Joachim playing the violin. The score was published in 1850 by Breitkopf & Härtel. The original manuscript is in the Jagiellonian Library in Kraków, Poland.
