Pianophiends

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Gus Kleinecke at the “baby grand,” which he does not leave, is responsible for the stage management. Mr. Kleineck “runs” the group perfectly from his position at the piano.
Five pianos on the stage, with five young men playing them as one. Four girls, modishly dressed and good looking or the foreground. Duets, quartets and octets in singing and dancing are given, with a lively finish, the company singing “I'd Rather Two-step than Waltz, Bill.”
Ye producers who deem your own act well put on, take a peep at this.
Source:
Variety 6:2 (06/08/1907)