[wilsonmw04]

Originally Posted by Herodotus

I don't believe there is any set amount for what is fair use. Theoretically a whole album could be used fair use, as could a whole book, a whole movie, and so on. It just becomes harder to justify. There aren't really any numbers involved in fair use, it's all a matter of how the judge interprets it and how he rules on it.

The numbers I threw out there are generally accepted as "rules of thumb" for fair use in an educational environment.