Well there is always Poulencs La voix humaine as a modern example The letterreading scene from La traviata although not often cited has the advantage of likely being more familiar to readers Some of the statements seem a bit offtopic to me but the article is pretty wideranging Another problem I see is the chronology seems a bit mixed up The sources I have mainly focus on theatre so I suppose I could add some things in that area We should probably be sure to mention some of the early plays like Kotzebues Menschenhass und Reue Schillers Die Ruber Pixrcourts Coelina and Holcrofts A Tale of Mystery