The editor would like to thank the following libraries for assistance: Hamburg, Staats- und Universitätsbibliothek; Wolfenbüttel, Herzog August Bibliothek; Dublin, Trinity College; King’s College (University of Cambridge) Library; Cambridge, University Library; Cambridge, Fitzwilliam Museum; Cambridge, Magdalene College, Pepys Library; Carlisle Cathedral, Dean and Chapter Library; Edinburgh, University Library, and Centre for Research Collections; Glasgow, Euing Music Library; London, British Library; London, Royal Academy of Music; Oxford, Bodleian Library; Oxford, Christ Church; Los Angeles, University of California at Los Angeles, William Andrews Clark Memorial Library; New York, New York Public Library; San Marino, Henry E. Huntington Library and Art Gallery. Thanks are also due to the trustees of The Andrew W. Mellon Foundation for funding, which facilitated this research. Particular thanks are due to the moderator Prof. Peter Holman and to the general editors, Profs Martin Butler, Ian Donaldson, and David Bevington, for their encouragement, advice, and assistance, and also to Dr Andrew Woolley for his comments on a late draft.