$260 million- Gross revenues from U2's recent Vertigo tour
3 million
The number of people who bought a ticket to see U2 on their Vertigo tour
50%
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The growth in the live-music audience in the past 10 years
21 days
The length of Prince's 2007 residency in London's 02 arena
€70
The price of Radiohead's concert in Malahide Castle this year
