"Sonata No. 29, titled ‘Hammerklavier’, was named after Beethoven received a newer incarnation of the piano, which gave him a broader tonal range and spurred him to create this piece. It comes in at over 40 minutes in duration, which was almost unheard of at the time. Beethoven had not written anything in almost a year when he revealed this piece. It marked the end of a depressive period in which Beethoven released a tumultuous amount of emotion in one sonata.
Murray Perahia says of the sonata: “The challenge of this music is still alive because one can get deeper and deeper into the piece’s mysteries. That’s endless – both musicologically and emotionally. Everything in it is connected. There isn’t a random note, yet it feels improvisatory. So it’s a mystery that will intrigue and occupy musicians forever.” "