London, Sep 13 (IANS): Singer Chris Martin says he was scared to ask Rihanna to appear as a guest-vocalist for his rock band Coldplay's new album "Mylo Xyloto".
"The album is designed as a whole piece. It has boy and girl lead characters and top of our list for the girl part was Rihanna. But it took a while to pluck up the courage to ask her," contactmusic.com quoted Martin as saying.
"She has such an amazing voice and it's so different to mine. When the vocal happened I thought 'Wow, you sound different' but I think that's also because she was singing a different song to what we are used to hearing from her and it is written by a guy from Devon," he added.
'Mylo Xyloto' will be released Oct 24 this year.