Amen Brother

Here is a link to an amazing 18 minute video (there is not much to see, so you can put it on a back screen and just listen to the audio), that explains a great deal about the history of sampling and its later encounters with copyright through one famous drum break. Well worth listening to, and yes, I think the clip is making fair use of the excerpts it utilizes to tell the story: if this isn't a transformative use, I don't know what is.