.... and thanks for the posting.
I know some people think the voice is Bix's. In my opinion, there is no way to know, the sound is so faint and undiscernable. Moreover, we don't have any authenticated example of Bix's voice. Perhaps, wishful thinking?
As far as your comment that the recording is great, I totally agree. In fact, Bix's solo is so remarkable that it was copied in several other recordings. From my article "Copying Bix":
Within three years of the Wolverines recording of Tiger Rag, four recordings of the song were made which are germane to the theme of the present article.
April 22, 1925. California Ramblers (under various pseudonyms depending on the record label: Five Birmingham Babies, Goldies Syncopators, etc.) with Red Nichols and Frank Cush on trumpet.
May 12, 1926. University Six with Chelsea Quealey on trumpet.
May 1926. Purple Pirates Orchestra. Unknown cornetist.
December 1927. Devines Wisconsin Roof Orchestra. Dick Happe and Alec Alexander on trumpet.
Bix's Tiger Rag, the recording, not the words, has been discussed in the forum for many years, most recently as a couple of months ago. See the thread