William James Henderson (1855-1937) was the author of Some Forerunners of Italian Opera (1911). "The purpose of this volume is to offer to the English reader a short study of the lyric drama in Italy prior to the birth of opera, and to note in its history the growth of the artistic elements and influences which finally led the Florentine reformers to resort to the ancient drama in their search for a simplified medium of expression." Это и многое другое вы найдете в книге Some Forerunners of Italian Opera (Dodo Press) (W. J. Henderson)