Irish pop group Boyzone's proposed comeback is under threat after singer Mika refused the band rights to one of his tracks. The group are planning a world tour and new album after reuniting for charity Children in Need. But the reunion is in jeopardy after Mika - real name Mica Penniman - reportedly banned the group from recording a version of his song I Gave It All Away. A source tells British newspaper The Sun, "He is keen to start writing for other pop artists as well as himself. But Boyzone isn't really what he had in mind. "He was hoping to work with some more interesting artists - Boyzone are a bit too cheesy."