Where once workers had to bend awkwardly to hold and whack headliners into place on the car's ceiling, a headliner now has sewn-in magnets that keep it in place on the roof's metal frame.

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Glastonbury's spending power is spread thinly across all the whole festival, rather than concentrated on the headliners, Michael says.

BBC: The secrets of Glastonbury's line-up

The Bonnaroo Music and Arts Festival, the other major summer music festival in the U.S., has slotted Paul McCartney, Wilco and Tom Petty and the Heartbreakers as their headliners this year.

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