The top-selling music album in the year 2000 sold nearly ten million copies.
The top album last year sold about a third of that number.
Many fewer people pay for music these days, when they can get it for free on the Internet.
Exactly the point of Stephen Witt's book "How Music Got Free."
Journalist Witt's book includes details like the engineers who developed the mp3 file, the music factory worker who leaked thousands of albums, and some of the key players in the industry's transition to an online model.
Stephen Witt joins us with the highlights.
