Although every instrument has a history of extreme techniques, the piano seems to have attracted more than its fair share of people wanting to see how far it, and they, could go. From Beethoven, who was known for destroying pianos during the course of a performance, through to John Cage (who invented the prepared piano by inserting screws, rubbers and bolts into it) and beyond, this episode of the Piano A–Z is not for those of a sensitive disposition.