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Mann Trio, three boys with good voices, lots of vim and vigor, sang several popular numbers, their high spots being “Si Si Si Si Senor” and “Chili Bean,” putting these other [sic] with their original way of putting harmony songs over, prove themselves a worthy asset on any small-time bill and can make a good showing on the two-a-day.
Source:
Variety Magazine, LVIII: 5 November 1920