<Li> Rami Yacoub--writing, production, programming, instruments, bass </Li> <Dl> <Dt> "Na Na Na" </Dt> </Dl> <Dt> "Na Na Na" </Dt> <Ul> <Li> Dick Beetham--mastering </Li> <Li> Iain James--writing </Li> <Li> Savan Kotecha--writing </Li> <Li> Matt Lawrence--engineering </Li> <Li> Greg Marriot--engineering assistance </Li> <Li> James Murray--writing </Li> <Li> Matt Squire--writing, production, backing vocals, mixing </Li> <Li> Mustapha Omer--writing </Li> </Ul>

Who sings what in what makes you beautiful