Paul Miller is the unofficial spokesman for remix culture in his persona as DJ Spooky. His latest book is "Sound Unbound: Sampling Digital Music and Culture." DJ Spooky tells Steve Paulson that young artists regard sound as a language they may freely sample to construct new compositions.

The mash-up is one form of remix culture. Jim Fleming talks with mash-up artist The World Famous Audio Hacker who's also known as Derek Chilcote Bacco, about what a mash-up is. Also, we hear a bit of the first ever mash-up: Charles Ives' "The 4th of July."

And, Charles Monroe-Kane breaks the law by singing "Happy Birthday," then Lawrence Lessig, a law professor at Stanford, tells Steve Paulson why that's absurd. Lessig is the founder of Creative Commons.

Jason Bittner is the editor of a website called Cassette From My Ex dot com. He talks with Anne Strainchamps and plays samples from various mix tapes he's received.

"To the Best of Our Knowledge" is an audio magazine of ideas - two hours of smart, entertaining radio for people with curious minds. More "To the Best of Our Knowledge"

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