500m people get album after hitting send
The two-hour-long Apple event ended with a live performance by U2. The appearance by Bono and band mates, which had been rumoured, brought enthusiastic applause from the crowd.
U2 played a single from the new album, Songs of Innocence, which Apple announced it had sent out for free to half a billion iTunes customers around the world. The release of the album proved a headache for iTunes, however, as it experienced technical difficulties due to the number of people attempting to download it.
