Quincy Jones and Lionel Richie's revamped We Are The World recording session is taking place at the same Los Angeles recording studio where the original tune was recorded 25 years ago.
Stars like Akon, Jason Mraz, Bono, Wyclef Jean, Usher and Lady Gaga are expected to flood the historic A&M complex in Hollywood on Monday night (01Feb10) to re-record the charity anthem.
The new song will benefit the aid relief in earthquake-ravaged Haiti.
Stars like Stevie Wonder, Tina Turner, Ray Charles, Bruce Springsteen and Diana Ross originally joined songwriters Richie and Michael Jackson and producer Jones in the studio on 28 January, 1985 to record the track.
That record raised more than $30 million (£18.8 million) for USA for Africa, a nonprofit organisation founded by the singers to fund hunger relief in Africa.