The famous (or infamous -, depending on how you look at it) Ferdinand Praeger book "Wagner As I knew Him" A book that Bayreuth - following Wagner's death - tried to ban (and caused to be withdrawn in Germany) and discredit. A book that may have lead to end of London's first Wagner Society - see here. In English translation. Available here in Kindle, Epub and web format. Simply click the version that you want.