[source: NME.com] U2 are in Morocco with long-term production collaborators Brian Eno and Daniel Lanois, although it's believed the pair's involvement is restricted to songwriting. "It's the first time we've worked with Brian and Dan in a purely songwriting capacity," Larry Mullen Jr told U2.com. "So it's very different – quite experimental and kind of liberating." However, the band are reluctant to confirm whether or not the new tracks will appear on the next album. "We have no plans for the music yet," Bono explained. "We're just going to make it until we can't not put it out!"