Prince's Sign 'O' the Times

One of the greatest double albums of the vinyl era, Sign ''O'' the Times shows Prince at his peak.

Here, Michaelangelo Matos tells the story of how it emerged from an extraordinary period of creativity to become one of the landmark recordings of the 1980s.

He also illustrates beautifully how - if a record is great enough and lucky enough to hit you at the right time - it can change your way of looking at the world.