"parody", which typically involves shorter duration.
Length of the excerpt has nothing whatsoever to do with whether or not a use is parody. Length of an excerpt compared to length of the whole work has something to do with whether or not a use is "fair use," and thus permitted without permission.
Similarly, parody is one purpose for adapting a copyrighted work, which is also a test of "fair use," with rather generous legal protection. The book Dave Barry's Book of Bad Songs
is an example of use that is fair use even though some of the quotations from some lyrics did NOT receive permission from the copyright holders--as is explicitly noted on the extensive credits page of Dave Barry's book.
Length of the excerpt has nothing whatsoever to do with whether or not a use is parody. Length of an excerpt compared to length of the whole work has something to do with whether or not a use is "fair use," and thus permitted without permission.
Similarly, parody is one purpose for adapting a copyrighted work, which is also a test of "fair use," with rather generous legal protection. The book Dave Barry's Book of Bad Songs
http://www.amazon.com/Dave-Barrys-Book-Bad-Songs/dp/08362144...
is an example of use that is fair use even though some of the quotations from some lyrics did NOT receive permission from the copyright holders--as is explicitly noted on the extensive credits page of Dave Barry's book.