Bach’s The Well-Tempered Clavier was written at a time when composers had begun to expand the limited tonal compass of keyboard instruments through far wider use of keys and; ultimately; equal temperament. The 48 preludes and fugues that constitute The Well-Tempered Claver are composed in a wide range of styles; and the work remains one of the most important and influential in Western classical music. Francesco Cera is a prominent Italian early music specialists and he plays on a copy of a Hemsch harpsichord of 1736; using his own personal tuning. For Book II he employs the Altnickol edition of the score which includes numerous variants.