I have striven with a certain amount of zeal to bring together all that appeared to render my narrative more graphic and lifelike, and have not refrained from adducing my authorities, partly for the sake of accuracy, partly to point the way to those who find the subject of interest. I have gone even further than this, and have added to the names of many persons, principally musicians, of whom mention had to be made, a short notice of their life and sometimes an epitome of their performances. It is probable that the minority of my readers will already have such facts in their minds, and they are essential to a clear perception of the whole work: I have been anxious to spare them the trouble of continual reference to a biographical dictionary. I have confined myself to the accessible and, of its kind, excellent Dictionary of Musicians by Gerber and Fétis, but my own investigations, leading me into the detailed history of this time, have not seldom supplied additional data for such notices; I remark this not to depreciate the merit of those works, but that it may not be supposed that my statements can always be verified by a reference to accessible authorities. You may perhaps smile at the zeal of the "philolog" betraying itself in such minute particulars. Be it so. I hold to my craft, and occasionally you will not find it amiss that I do so. I may remark besides, not to you, but to those who hold in horror notes, digressions, quotations, and references as the merciless weapons of pedantry, that they need not for this {INTRODUCTION.} (xxi) reason at once reject my book. I have striven so to write that the text is complete in itself and requires no notes for its comprehension; and those who do not desire the information they contain, may contentedly pass them over. On the other hand, I hope that you will uphold my opinion that the application of the scientific method even to these researches, cannot but be to their advantage. This is perhaps most strikingly evident in the chronological notification of each separate work. We are well supplied with chronological information as to Mozart's compositions. From 1784 onwards we possess his own carefully compiled thematic catalogue which André has edited (Offenbach, 1805 and 1828). On earlier compositions the data is generally correctly given with the autograph signature, and the list of authentically dated works comprises by far their greater number. But not quite all; the autograph is wanting to many, and they are not all dated. It thus becomes necessary to resort to classification resting on the external evidence of paper and handwriting, and the internal evidence of style and technical treatment, as well as on the testimony of witnesses.