#1Beethoven, the Man and the Artist...de gutenberg68511friedrichgutenberghenry+mais 6 #2How to Listen to Music, 7th ed. Hi...de gutenberg37601henryedwardkrehbiel+mais 1 #3A Second Book of Operasde gutenberg28001henryplotsoperas+mais 5 #4Chapters of Opera Being historical...de gutenberg42821newgutenbergkrehbiel+mais 5 #5A Book of Operas Their Histories...de gutenberg26101gutenbergkrehbieledward+mais 1