Book excerpt: Although eighteenth-century Viennese keyboard music, especially by such composers as Haydn, Mozart, and Beethoven, is among the most popular ever written, there has been surprisingly little serious research into the instruments for which it was composed. This book fills that gap. Based on evidence from primary source material, much of it previously undiscovered or neglected, Maunder traces the history and development of the various keyboard instruments available in Vienna throughout the eighteenth century--harpsichords, clavichords, and pianos--and their use by composers and performers.