Wilhelm Kempff was one of the greatest pianists of the twentieth century, and his interpretation of Germanic piano literature has been honored in Europe, Africa, Asia, and America by many distinguished musicians and music-lovers. But perhaps because he was already sixty-nine years old at the time of his American debut in New York in 1964, his reputation as a pianist tends to be disregarded in English speaking nations. Even Alfred Brendel acknowledges in his book Me of All People: "I return again and again to Kempff, because he is a pianist who seems frequently underestimated today." Furthermore, Kempff's activities as a transcriber, organist, and composer are even less well known. Thus this book will introduce Wilhelm Kempff's life and music, and present a study of his solo piano transcriptions of J. S. Bach's chorale preludes for organ. This book will examine: 1) basic transcription techniques; 2) coloration/timbre; 3) fingering to create beautiful legato; 4) pedaling; and 5) pedagogical suggestions. This book also will present a brief history of piano transcriptions, followed by a detailed analysis of the two chorales.