Final answer:
The phrase 'gangster music' in quotation marks suggests it is not the author’s own term but rather one quoted from another source, affecting the text’s tone and meaning.
Step-by-step explanation:
The author may have used quotation marks around the phrase "gangster music" to indicate that it is not a term that the author coined, but rather one that is being cited from another source, possibly a complainant.
In written language, quotation marks can be used for a variety of reasons, including to attribute a term to someone else, to indicate irony or a non-literal usage, or to signal an unusual or contested term. When analyzing stylistic choices, it's important to consider how the usage of a word or phrase might affect the meaning or tone of a text.
For example, in the context of literature or music criticism, phrasing like "gangster music" might carry connotations or spark associations that go beyond the literal genre of music being discussed, possibly touching on social or cultural critiques.