The first iPod debuted 20 years ago this year, revolutionizing the way we consume and listen to music. Alan Cross, host of "The Ongoing History of New Music" and co-author of "The Science of Song: How and Why We Make Music" joins Steve Paikin to discuss the impact it had on the music industry. He also talks about reaching his 40th year in the radio business, how it's changed, and why it's still relevant.
