N.E.R.D recruit new group member

N.E.R.D have added a classically trained singer to their current line-up.

The group, fronted by Pharrell Williams, have recruited Canadian singer Rhea to work on their next album and she will also play at future live shows.

Speaking to MTV News, Williams said: "Musically, we're just somewhere else [with her]. The music is now very 3D. It's something you have to hear. But you'll see."

The band are currently working on the follow up to 2008's album 'Seeing Sounds', and said it will be a "little different" from their previous offerings.

Williams added: "The music is very three-dimensional. We're just really excited. We feel like N.E.R.D has always been the punks of hip-hop and the outcasts of alternative music — just a little different. But this time, we're taking no prisoners."

N.E.R.D are set to release their fourth album 'Instant Gratification' in 2010.