It also presents an interesting critique of academics/critics and attempting to analyze past works through the lens of contemporary values. Shuffle Along is, by contemporary standards, a racist musical. But it was written and performed by black artists and was a highly influential accomplishment- Langston Hughes credits it as the opening shot of the Harlem Renaissance.
It's a very heady number, something I've never seen before in a musical, and, as you say, somethingwicked, an important number in the show.
The first act is the accomplishment, the joyful and thrilling creation of black writers, composers, performers, artists.
The second act sees that accomplishment copied, stolen, and ultimately denigrated and rejected.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."