( news.bbc.co.uk ) - US rock singer Lenny Kravitz has been revealed as the headline act for the Brazilian leg of Live Earth. Other acts confirmed for the concert on Rio's Copacabana Beach include Pharrell Williams and Macy Gray. Eight cities will be holding concerts across 24 hours on 7 July to highlight climate change.
Madonna and Duran Duran are playing the UK concert at Wembley Stadium, while the US leg will see The Police, Alicia Keys and the Smashing Pumpkins perform.
Brazil is the only country hosting a Live Earth concert that is entirely free and open to the public, and organisers are hoping to attract up to one million visitors.
'Audience of billions'
Aside from the US acts, Rio will play host to a number of native performers, including singer Xuxa, reggae rock band O Rappa and rapper Marcelo D2.
Other countries hosting concerts include Germany, Japan, Australia, China and South Africa.
Linkin Park and Rihanna are headlining the Japan concert, while UB40 and Joss Stone will be playing in China.
The Istanbul concert was recently scrapped because of a lack sponsorship and interest in the Turkish event.
Former US Vice-President Al Gore, who is one of those involved in organising the events, said he expected Live Earth to attract "an audience of billions".