Coldplay's Chris Martin to join The Voice.
Coldplay frontman Chris Martin is bringing his star power to NBC's singing competition The Voice to advise the show's coaches in a rebooted round of performances.
The 37-year-old singer will serve as a guest mentor on episodes airing March 31, April 1 and April 7, according to an announcement by NBC via social media.
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For the first time on the show, Martin will serve as an adviser to all four coaching teams in a newly created portion of the show called The Battles: Round Two, which replaces the former Knockout Rounds.
In the new format, the remaining artists from each team -- all previous
winners and stolen artists -- will face off by singing the same song.