Coldplay's Chris Martin has said that a song he wrote for Beyonce didn't make the cut.

Speaking to Maxim, Martin said 'I did write a song for Beyonce, but it got rejected by her A&R people.' He goes on to say that 'The one I wrote for Rihanna didn't get rejected.'

'It was when [Rihanna] was doing Rated R, but it took so long ' there's still this tribalism in music where we're rock and you're pop and you're hip-hop and it sometimes takes a while to get across those barriers,' he explains. 'So once we started thinking like that, it was, 'Who cares if we used to be shelved in different places in Tower Records?' She's fucking rad, and I love listening to her. It's my favourite real singing on the album, 'cause it isn't me.'

The song Rihanna will appear on is called 'Princess of China' and appears on the new Coldplay album 'Mylo Xyloto'.

Beyonce's latest album '4' has been out since June.