Chris Martin, Lily Allen and Alesha Dixon are among celebrities urging volunteers to become "dementia friends" and help care for those with the degenerative condition.
Volunteers who take part in the scheme will be able to attend free sessions to learn how to spot the signs of dementia and offer support for sufferers, the Alzheimer's Society said.
In a new ad which will be aired for the first time tonight, the pop stars will be seen performing The Beatles' track I Get By With A Little Help From My Friends.
Other celebrities involved in the ad include comedian Simon Pegg, actor Ray Winstone, footballer Leighton Baines and presenter Paul O'Grady.
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And we’re off! All aboard the big-blue-battle-bus, union flag fluttering and a typically dry election slogan stretching across the side.
Tracey Emin was forced to wipe away tears as she unveiled her £2.54 million unmade bed on its return to its "home" at the Tate.
Rapper turned businessman Jay Z is to announce his own music streaming service to rival Spotify tonight revamping his technology company