My gg-grandfather, Constantine Kollros (1838 – 1916), was a band leader in Louisville, KY around the turn of 20th century and as I learned last night, he was also a composer. In a search of Google Books, I found “Gambrinus March – copyright by C Kollros Louisville Ky July 7, 1898” listed in a publication of the Library of Congress Copyright Office in that year. Wikipedia defines Gambrinus as “an unofficial patron saint of beer or beer brewing.” The origin of the character is most widely believed to be John the Fearless (1371–1419), who some also believe to be the inventor of hopped malt beer.

According to an article that appeared on the front page of the Kentucky Irish American newspaper dated 24 Oct 1903:
The Mozart Symphony Orchestra directed by Prof Constantine Kollros will give its first grand concert at Phoenix Hill on Monday night… the programme will include Gambrinus March dedicated to the Gambrinus Society words by Frank A Lenz music by Prof C Kollros.
Note the title of Professor and it brings to mind Professor Henry Hill (aka The Music Man).
A further search of “Gambrinus March” turns up a different (?) composition by the same name. It lists lyrics by a H. Sallman, is dedicated to the Sieben’s Brewery Co. and copyrighted 1915 by Sieben’s Brewery Co., Chicago, Illinois, but it does not say who was the composer.
A trip to the Library of Congress may be in order, because according to the catalog there is one copy in the library. The LC on-line catalog mislabels the title as Cambrinus march (Published/Created: Louisville, Ky. C. Kollros, 1898. CALL NUMBER: M1540.K81 G3). 
Constantine Kollros was born on February 17, 1838 in Sasbach am Rhein, Grand Duchy of Baden. He was the son of Joseph Kollros and Magdalena Ringwald. He married Maria Eichhorn, daughter of Georg Eichhorn and Catherine, after 1863 in Louisville, Jefferson County, Kentucky. He died on November 28, 1916 in Louisville at age 78. He composed at least two other musical pieces that I have found listed: Cleanse thou my soul; Asperges me (1883) and Cecilian Waltz (1907) 