Busoni's contribution to the art of the piano transcription is formidable. His chorale prelude transcriptions make him responsible for giving over to the piano repertoire a small portion of sacred literature. His special admiration of J. S. Bach, evidenced throughout his life, make Busoni's transcriptional practices all the more significant. Bach himself was a prolific transcriber of his own works and the works of others. This paper presents a brief history of keyboard transcriptional practices, emphasizing Busoni's methods by comparing the original works for organ with the transcriptions for piano. Four chorale preludes form the basis for this study: Ich ruf' zu dir, Herr Jesu Christ (BWV 639), Komm, Gott, Schopfer, Heiliger Geist (BWV 667), Nun komm' der Heiden Heiland (BWV 659), and In dir ist Freude (BWV 615).