Composed during his ‘middle period’, Beethoven’s two Op. 70 Piano Trios are typically dramatic works full of structural and thematic innovation. The striking Ghost Trio, so-called after its slow movement with its eerie and sombre tremolos in the lower register of the keyboard, is a work of extraordinary tension, unusually fragmented material and unstable harmonies. By contrast, Piano Trio No. 6 is one of Beethoven’s most subtle chamber works, mellow, lyrical and intimate in nature.