"A lot of people imagine that mashup culture is something unique to the digital age, but it goes all the way back to Benjamin Franklin taking popular songs and changing the lyrics to make a comment or a protest about a political situation."

From an interview with the authors of Tales from the Public Domain: BOUND BY LAW?, a comic explaining the principles of copyright and fair use, and how they have gone wrong over the last few decades. The authors believe in their premise, as they are giving away the book under a Creative Commons license.