U2 have revealed that they have begun work on a new album.The follow-up to 2009's 'No Line On The Horizon', the as-yet-untitled album is set to be "really special"."We are working on a lot of new songs," The Edge told EW. "Some of them are really, really happy.We're convinced that we have something really special."Adding that the band have been working on material in-between legs of their world tour, the guitarist revealed a little more about the making of the album."We are experimenting with a lot of different arrangements, and electronic is one of the things we are playing with," he explained. "But there are other songs that are very traditional, almost folk. That's the thing we haven't figured out yet, where this album is going to end up."Meanwhile, U2 frontman Bono has recorded a new song with Jay-Z, to help raise money for those affected by the recent earthquakes in Haiti.
