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In page ACF Fiorentina:

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"Canzone Viola" (Purple Song) is the title of the Fiorentina's song, nowadays better known as "Oh Fiorentina".[1] It is the oldest official football anthem in Italy and one of the oldest in the world.[citation needed] Dated 1930 and born only four years after the creation of the club, the song was written by a 12-year-old child, Enzo Marcacci, and musically arranged by maestro Marco Vinicio.[citation needed] It was published for the first time by the publisher Marcello Manni, who later became the owner of the rights.[citation needed] It soon achieved notoriety thanks to the printed media and the Ordine del Marzocco, a sort of original viola-club, which printed the lyrics of the song and distributed it to a home match on November 22, 1931.[2]