What's a song worth?

Music streaming services have changed the game. We hear about their impact on artists' income from Tom Gray of the 90s British band Gomez. Plus, Merck Mercuriadis, whose music investment company Hipgnosis is spending billions of dollars buying the copyright to some the biggest music hits of the past 50 years.

(Picture: dollar bills rain down on US pop star Miley Cyrus. Credit: Getty Images.)