Sunday Night at the Trocadero

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The Brian Sisters sing in Sunday Night at the Trocadero.
The Brian Sisters sing in Sunday Night at the Trocadero.

Directed by George Sidney, this 1937 short film appears as a special feature on the DVD version of the Marx Brothers' AFI Top 100 Film, A Night at the Opera (film). Cameos by dozens of then-Hollywood luminaries make this interesting viewing.

Reference: International Movie Database (IMDB.com)[1]