Piano Trio No.6 in E-flat major, Op. 70

The first, in D major, known as the Ghost, is one of his best known works in the genre (rivaled only by the Archduke Trio). The D major trio features themes found in the second movement of Beethoven's Symphony No. 2. The All-Music Guide states that "because of its strangely scored and undeniably eerie-sounding slow movement, it was dubbed the 'Ghost' Trio. The name has stuck with the work ever since. The ghostly music may have had its roots in sketches for a Macbeth opera that Beethoven was contemplating at the time."