Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Forty years ago author Norman Mailer published an essay in which he declared the graffiti of the New York subway to be "The Great Art of the 70s". But what happened to the artists and why is there no subway graffiti any more?

Great Art? The graffiti of the New York subway