'Nobody', wrote Samuel Johnson, 'can write the life of a man, but those who have eat and drunk and lived in social intercourse with him.' Here is a life of Wagner told by those who rubbed shoulders with him in the course of his turbulent lifetime. Few composers have led such eventful lives or excited such violent views, and his contemporaries were not slow to record their impressions of a man they either idolised or demonised. This is the story of...