Those Four Entertainers

singing/comedy quartet / early 1900's

Those Four Entertainers seem to have started their careers in 1911,
as the San Francisco Chronicle of December 17, 1911 (pg.22)
says it's their first time the Orpheum:

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and by 1916, although still popular, they were not appearing as often:

- Red Bank (New Jersey) Daily Register / February 9, 1916 (pg.10) -