Groh Brock and Co.

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The act was twenty-three minutes long. Brock and co. only attempt a sketch for a few minutes before they sing several songs as a quartet. They change costume for each number in which they perform as different nationality types.
"After one watches the four work with the song bits he wonders why they attempt any sketch at all." The sketch will draw some laughs from the pop audiences, but the quartet act will get them farther.
Source:
Variety 28:8 (25/10/1912)