Hiller's Treatise on Vocal Performance and Ornamentation was published in Germany in 1780 and is an important manual on vocal technique and performance in the eighteenth century. This present edition, translated with an introduction and extensive commentary by musicologist Suzanne J. Beicken, makes the treatise available for the first time in English. With its emphasis on practical aspects of ornamentation, declamation and style it will be valuable to instrumentalists as well as singers and is a significant contribution to the understanding of performance practice in the eighteenth century.