With its monster-selling Vertigo world tour complete, U2 may be ready to rock less, according to frontman Bono. "Our band has certainly reached the end of where we've been at for the last couple of albums," the newly dubbed honorary knight said during a BBC Radio interview earlier this week. "I want to see what else we can do with it, take it to the next level; I think that's what we've got to do." 　　

Asked if that might mean a move away from rock 'n' roll, Bono replied, "We're gonna continue to be a band, but maybe the rock will have to go; maybe the rock has to get a lot harder. But whatever it is, it's not gonna stay where it is." 　

He said he's like U2 to explore compositions featuring just voice and acoustic guitar. "I would like to do a couple of tunes in that direction, with just a lot of space around the voice," he said. "I'd like to strip things down; that's something I'd be very interested in at the moment." 　　

U2 is expected to get busy in the studio after the New Year, with an eye on releasing a new album before the end of 2007. Bono said casual fans were the target for the recently released compilation "U218 Singles," which includes two new songs. 　

"We've never been much of a singles band," he said. "But we did it because we have a very young audience coming through, and we wanted to, you know, just be very available for people who want to check us out, you know? We wanted to have something they could check us out very easy on." 　　

U2 lead singer Bono is shown in this file picture. Bono has been given a honorary knighthood, the British Embassy in Dublin said on Saturday.