The keyword term "patriots day soundtrack country song" functions grammatically as a noun phrase. Its primary part of speech is determined by its head noun, which is "song." The entire phrase acts as a single unit to name a specific person, place, thing, or idea, and it would serve as the subject or object within a larger sentence.
A detailed analysis of the phrase reveals a chain of modifiers specifying the head noun. "Song" is the core element. "Country" is an adjective modifying "song" to specify its genre (a "country song"). The word "soundtrack" acts as a noun adjunct, a noun used as an adjective, to modify "country song," indicating its source or context. Finally, the proper noun "Patriots Day" also functions as a noun adjunct, further specifying which soundtrack is being referenced. Each preceding word narrows the definition of the final noun.
Understanding this grammatical structure is crucial for article development because it establishes the main point as a specific entity. The article's focus is not on an action (verb) or a quality (adjective), but on a tangible piece of media. Therefore, the content must be centered on identifying, describing, or analyzing this specific type of musical track from the film's official music collection. The keyword phrase defines the subject matter itself.