Coldplay were hypnotised during sessions for their new album.
Launching the album in Madrid, frontman Chris Martin said: "We're not afraid to try different things.
"Brian Eno brought a friend in and the four of us were playing music under hypnosis.
"We have been in a band long enough where we are comfortable to explore new ideas.
"It didn't really come to anything. You try 10 ideas and only one works. But nothing is too stupid for us."
The band also had strong words for those who have accuse them of plagiarism, something they have always strongly denied.
Chris added: "Its fine to not like the band, but it's not right to accuse us of plagiarism. It's a very big difference between criticism and accusation. The people who do that are just *****, quite frankly."
There was confusion over the band's single, 'Every Teardrop is a Waterfall', which was compared to Peter Allen track 'I Go to Rio' and dance track 'Ritmo De La Noche' by Sacados. Chris said he was inspired by the latter track, which takes a sample from the former, which the band then used themselves as part of their song. Peter Allen also received a writing credit for the use of the sample.
The band were also subject to a 2008 copyright infringement lawsuit from guitar player Joe Satriani, who claimed their track 'Viva La Vida' had copied his song 'If I Could Fly', but this was dismissed by a court.