U2 singer Bono is expressed his excitement about U2's next album, saying that they have been working on it for months.
The 'Elevation' rockers are writing tracks for their 13th studio album - with the working title '10 Reasons To Exist' - which will be their first release since 2009's 'No Line on the Horizon'.
Singer Bono told The Sun newspaper: "U2 have been back and they're really in fine fettle.
"They're mad for it at the moment and they really want to make a new record.
"And they don't care if it takes 10 years - they don't care if it never happens again, they just want to get it right.
"Within the band we've been calling it '10 Reasons To Exist' - but I will tell you we might have at least six of them."
Bono added the band had halted recording in December after he got flu.
U2 - which also includes The Edge, Adam Clayton and Larry Mullen - completed their '360 Degree' tour, the highest grossing of all time, in 2011, and then took time off to rest and recuperate.
Bono took his family on a round the world trip of the world's most spiritual regions, which may have influenced him for the band's new album.
Speaking about the trip Bono said: "Because I wasn't busy with the band we kind of went wandering. Once in a lifetime sort of stuff, places like Africa and Central America.
"We also went to Jordan and Israel and Peru. It was really great to have time off."