The U2 frontman has responded to 'Songs Of Innocence' criticism saying it's his band's job to 'stir things up a little bit'
Frontman says new development with Apple is 18 months from existence
Manager and TV personality also brands U2 'middle-aged political groupies'
The trade organisation have called the giveaway 'a dismal failure'
The LP was given away for free and automatically downloaded onto users' devices
Some 24 of the band's titles have reached the top 200 of the iTunes chart globally
Odd Future rapper asks "You couldn't come up with an actual marketing idea?"
Physical copies of the album will be released October 13
Universal Music Group spokesperson says figures are 'inaccurate'
Band released surprise new LP yesterday (September 9)