@Ernest Bywater
Which, again, shows how the US Supreme Court will try to re-write laws instead of applying them as they are.
No, it shows you don't understand US law the way you think you do.
Yes, what is considered fair use in the US is much broader than it would be in other countries. This is a consequence of the 1st amendment to the US constitution, not the US Supreme Court re-writing copyright law on a whim.
The way the US constitution works, to the extent that Copyright law is in conflict with the 1st Amendment, it is copyright law that must bend, not the 1st Amendment.
In the realm of music, the US has mandatory licensing schemes in place. The license fees are paid to a central agency set up for that purpose.
In the case of parodies generally, long standing fair use analysis at the time was actually codified in the 1976 copyright act.
From the link that was posted by Mushroom:
This analysis was eventually codified in the Copyright Act of 1976 in Β§ 107 as follows:
Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright. In determining whether the use made of a work in any particular case is a fair use the factors to be considered shall includeβ
(1) the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;
(2) the nature of the copyrighted work;
(3) the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and
(4) the effect of the use upon the potential market for or value of the copyrighted work.
Please note that while how much of a work is use is a factor:
1. there is no specific proportion/percentage specificed
2. The amount of the work use is neither the first nor the primary factor.