Rap

occurs in: The Tyranny of Structurelessness, p. 1 (“structureless rap group”)

Del the Funky Homosapien similarly states that rap was used to refer to talking in a stylistic manner in the early 1970s: "I was born in '72 ... back then what rapping meant, basically, was you trying to convey something—you're trying to convince somebody. That's what rapping is, it's in the way you talk."

[lazily copied from Wikipedia: Rapping]