In London's Hyde Park, those performing include Mariah Carey, Coldplay, Dido, Keane, Sir Elton John, Annie Lennox, Madonna, Muse, the Scissor Sisters, Sir Paul McCartney, Joss Stone, Stereophonics, Sting, Snoop, Robbie Williams, U2 and REM.
In Philadelphia, acts performing will include Will Smith (hosting), Bon Jovi, Maroon 5, Dave Matthews Band, Sarah McLachlan, Rob Thomas, Keith Urban, Jay-Z, Stevie Wonder, 50 Cent, Kaiser Chiefs and P Diddy.
Among artists scheduled for Berlin are A-Ha, Bap, Crosby Stills and Nash, Lauryn Hill, Die Toten Hosen, Peter Maffay and Brian Wilson.
The concert in Rome will feature musicians including Irene Grandi, Faith Hill, Jovanotti, Tim McGraw, Nek, Laura Pausini, Duran Duran, Vasco Rossi and Zucchero.
In Paris, Andrea Bocelli, Craig David, Calogero, Jamiroquai, Kyo, Yannick Noah, Youssou N'Dour, Placebo, Axelle Red, Johnny Halliday, Manu Chao and Renaud will be among those taking part.
Yes -- yet again, the UK gets a much better show than Philadelphia.
And, yes, it's that Yannick Noah.