.... of Sep 8. 1930 is well known.
Here is Burnett James strory via Jack Teagarden of three trombonists inadvertently hired by Bix.
Virtually the same story as that of the three clarinetists. Problem: there were only two trombonists (Cullen and Teagarden, no Dorsey; right?) in the Hoagy session of Sep 15, 1930.