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 specialist 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.