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Rh pure and simple, it is unlikely that the work will act as a substitute for the original, since the two works usually serve different market functions. The fourth factor requires courts also to consider the potential market for derivative works. See, e. g., Harper & Row, Publishers, Inc. v. Nation Enterprises, 471 U. S. 539, 568. If the later work has cognizable substitution effects in protectible markets for derivative works, the law will look beyond the criticism to the work’s other elements. 2 Live Crew’s song comprises not only parody but also rap music. The absence of evidence or affidavits addressing the effect of 2 Live Crew’s song on the derivative market for a nonparody, rap version of “Oh, Pretty Woman” disentitled 2 Live Crew, as the proponent of the affirmative defense of fair use, to summary judgment. Pp. 590–594. 972 F. 2d 1429, reversed and remanded.

, J., delivered the opinion for a unanimous Court. , J., filed a concurring opinion,.

Bruce S. Rogow argued the cause for petitioners. With him on the briefs was Alan Mark Turk.

Sidney S. Rosdeitcher argued the cause for respondent. With him on the brief were Peter L. Felcher and Stuart M. Cobert.

delivered the opinion of the Court.

We are called upon to decide whether 2 Live Crew’s commercial parody of Roy Orbison’s song, “Oh, Pretty Woman,”