This is one of the later Vitaphone shorts--known as a "Melody Master". These later musical shorts generally were more straight forward and had simpler sets and no real story to tie it all together--just a famous band of the day doing their stuff.
This short features Woody Herman and his band. It begins with a zippy rendition of "Carolina In The Morning" sung by Herman himself. Then two girls who look like twins do a ballet-like dance that, frankly, was a bit weird...yet dull. I'd have rather just heard Herman sing another tune--which he did next with "You Must Have Been A Beautiful Baby". While he didn't have a strong voice, it was smooth like glass and very pleasant. Unfortunately, once again his singing was followed by a couple jitterbuggers wearing taps. They were pretty good but I just liked the singing more. And, as the pattern continued, Herman sang another song one the dancers were finished. Overall, a pretty typical sort of short--pleasant but not a lot different from the norm.