Their next album will be Coldplay's fourth full-length studio release
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Singer Chris Martin has described a track written for Coldplay's next album as "basically genius", saying it could be their best composition yet.
The 30-year-old added that everybody "has to hear this song before we die, otherwise we'll be terribly depressed".
He said the band planned to return to the studio and would create a different sound to that of their last album, X&Y.
Their enduring success meant that they could experiment with "new things", he told a press conference in Mexico City.
"I think for a long time, people felt like we were a band in black-and-white.
"Because we have this incredible job, now we can do whatever we like, and try all kinds of new things," Martin added.