Something doesn't seem right about the Rigler-Deutsch Index on WorldCat. For example, I was surprised to find Billy Murray singing "Diplomat" on 9" Zon-o-phone 6062 (a title I didn't know he recorded), but further investigation shows this is an instrumental selection by Hager's Orchestra, released February 1905. There's also matrix numbers on Zon-o-phone discs in WorldCat that doesn't match with the discs I inspected. Why is this? Is this a case of scanning the Index and mis-matching the data? -Ryan