Bono has admitted that he is disappointed with the poor sales of the latest U2 album No Line On The Horizon.

Although the record has shifted a million copies, it's U2's lowest selling LP of the last decade, while the singles 'Get On Your Boots' and 'I'll Go Crazy If I Don't Go Crazy Tonight' only charting at 12 and 32 respectively.

In an interview with spinnermusic.co.uk, Bono confessed that the band hadn't "pulled off the pop songs".

He said: "We weren't really in that mindset and we felt that the album was a kind of an almost extinct species, and we should approach it in totality and create a mood and a feeling, and a beginning, middle and an end.

"And I suppose we've made a work that is a bit challenging for people who have grown up on a diet of pop stars."

U2? Too challenging for people? That must be it.