The term "patriot day music" is a noun phrase. The head noun, which is the main point, is "music." The words "Patriot Day" function collectively as an adjectival modifier, specifying the type, theme, or context of the music.
In this grammatical construction, the proper noun "Patriot Day" acts as a noun adjunct. A noun adjunct is a noun that modifies another noun, functioning like an adjective. This is a common English pattern, as seen in phrases like "kitchen table" or "computer science." The modifier "Patriot Day" narrows the scope of the noun "music" to a specific subcategory: music that is appropriate for, performed on, or thematically linked to the U.S. national day of remembrance on September 11th.
For the purpose of writing an article, this grammatical analysis establishes that the core subject is the music itself. The article's primary focus should be on the musical selections, genres, emotional tone, and typical instrumentation associated with this specific day of solemn commemoration. Understanding this structure prevents the article from becoming a general history of the holiday and instead directs its content toward a specific analysis of its associated musical landscape.