Robbie Williams and estranged songwriting partner Guy Chambers are to reunite as the singer plans his musical comeback. The pair fell out after Williams signed a GBP30million ($60million) song deal with EMI records in 2002, but have now put their differences behind them to record some new tracks. Chambers - who helped to turn Williams into one of the biggest pop sensations in Britain - is hoping to help the troubled star bounce back to the top of the charts. A source tells The Sun newspaper: "Rob's going back into the studio with Guy later in the year. They have been talking on the phone a lot and they are excited by it all." The singer is also reported to be working with other big name music producers Mark Ronson, William Orbit and Soul Mekanik.