Coldplay admit to 'bad vibes' within the band

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Image caption, Coldplay have released new single Christmas Lights

Coldplay have said there were "bad vibes" within the band as they concluded their 2009 Viva La Vida world tour.

Speaking to Radio 1's Zane Lowe lead singer Chris Martin said: "When we came back from America last time we had some bad stuff happening in our group."

He went on to add that the band are currently working on songs for their as yet untitled fifth album in 2011.

"We're going for it. We regard this as our last big shot," he said.

'Worst song'

"We had a lot of songs and we cut a lot of songs. It's quite brutal - especially if you're the person which brings the songs. Now we're close to what the album might be."

Chris Martin and guitarist Johnny Buckland were speaking as they released new single Christmas Lights on iTunes (1 December).

Talking about the song Martin said: "We had to pluck up a lot of courage but the problem is that we really like it so that's why we had to put it out.

"Not to be arrogant - it's not our worst song."

Chris Martin joked that the song was the "end of our career".

This Christmas Coldplay will be playing two special sold out shows for the Crisis charity in Liverpool and Newcastle on 19 and 20 of December.