Beethoven: Grosse Fuge for String Quartet in B Major, Op. 133

It was originally intended to serve as the last movement of his Op. 130 quartet, but Beethoven later opted for a much shorter finale, leaving the Grosse Fuge to stand alone.

The Gewandhaus Quartet from Leipzig -- the world's oldest continuous string quartet -- performed the work in the chamber music hall next to Beethoven's birth house as part of the 2008 Beethovenfest in Bonn.