Six Hits and a Miss, Jeanette MacDonald - High Flyin' (1939)

From the film Broadway Serenade (1939).
According to IMBd, it's Six Hits and a Miss singing here. It definitely sounds like them (and those four actors are definitely lip-synching), but they're not actually credited in the movie and I can't find any outside verification that it's them. I assume Pauline Byrnes, Vince Degen, Bill Seckler and Marvin Bailey were in the group around this time, but I'm not sure on anyone else.
If anyone knows who the juggling troupe is, please share!
Music by Herbert Stothart and Edward Ward, lyrics by Chet Forrest and Bob Wright.