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Vitak-Elsnic Company, a division of Music Publishers of America, was established in 1912 by Louis Vitak, a Bohemian immigrant to the Untied States. The company sells music composed and arranged in the 20th century for piano, accordion and small band, as well as modern arrangements for concert and marching band, full orchestra and small ensembles.
More background information on Vitak-Elsnic is contained in this introductory Youtube video:
https://www.youtube.com/watch?v=ZzMsDi7HFLs&t=7s