Yoko Ono, Flaming Lips Deliver Message on 'Letterman'

Wayne Coyne and Co. help out on 'Cheshire Cat Cry'

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Yoko Ono and her Plastic Ono Band teamed with the Flaming Lips to deliver a message last night on the Late Show With David Letterman. Performing "Cheshire Cat Cry" off album Take Me to the Land of Hell, Ono couldn't have been more direct:  "Stop the violence," she commanded. "Stop all wars."

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The singer alternated between repeating the message and a maniacal giggle-like chant throughout the performance while holding up a peace sign as her band and members of the Lips rocked out together behind her – including Wayne Coyne, who was seated near her with a megaphone and shaker, shrouded in a hood before removing the disguise midway through the song.