Justin Bieber, U2 to contribute songs to Japanese charity disc

London: Artists Justin Bieber and U2 are among artists who have agreed to donate songs for a charity album to benefit the victims of Japan`s earthquake and tsunami. Record label Universal Music said it hoped to release the digital-only album globally by the end of the week, reports the BBC. Bon Jovi and Rihanna have also been confirmed for the album, which will raise money for the Japanese Red Cross. "We are doing it only digitally because it is faster," said a Universal spokesman, adding that the record would be "a worldwide release". Announcing his involvement with the album on Twitter, Bieber wrote: "Japan needs our help... We all need to step up." ANI