Roger Daltry, left, and Peter Townshend, leaders of the rock group, The Who, are preparing for a one-day reunion of the group for the famine relief concert.

LONDON (AP) — Top rock acts including Elton John, Paul McCartney and Stevie Wonder will take part in concerts in London and Philadelphia next month to raise more money for Ethiopian famine relief, organizers said yesterday.

A spokesperson at Philadelphia’s City Hall said last night that it is not known at this time when the tickets will go on sale. Public announcements will be made about the availability of tickets. Sales will be handled by Ticketron.

“The idea is to have a global jukebox under the banner ‘Live Aid,’” said Bob Geldof, leader of the specially formed English rock group Band Aid, which is staging the events.

“The most important people in the music world of the past 20 years will be taking part in this event and will be giving their services free,” Geldof, lead singer for the Boomtown Rats, told at a news conference.

The concerts will be staged July 13 at Wembley Stadium in London and the John P. Kennedy Stadium in Philadelphia.

Telecommunication satellites will beam the shows to an estimated 1 billion people around the world, including the Soviet Union and China.

Stars performing at Wembley will be: Adam Ant, Boomtown Rats, David Bowie, Phil Collins, Elvis Costello, Dire Straits, Brian Ferry, Elton John, Howard Jones, Nik Kershaw, Alison Moyet, The Pretenders, Queen, Sade, Spandau Ballet, Status Quo, Style Council, Sting, U2, Ultravox, Paul Young, Wham!, The Who and Paul McCartney.

In Philadelphia, entertainers will include Eric Clapton, Duran Duran, Mick Jagger, Paul Simon, Tears for Fears, Neil Young and Stevie Wonder.

Geldof said he hoped the event would raise at least $12.5 million for the famine victims in Ethiopia.

Band Aid has already raised nearly $9 million for famine relief, mainly through sales of its record “Do They Know It’s Christmas?” An equivalent effort in the United States resulted in the hit single “We Are the World.”

“As the situation worsens in Africa, Band Aid has kept millions of people alive,” Geldof said. “It is not enough just to keep them alive — we must give them a life as well.”

Tickets for the London concert will cost the equivalent of $31.50, and organizers expect 72,000 people to attend.

“The music business has finally got itself together in a unique way to pool its resources,” said promoter Harvey Goldsmith. “Rock music has highlighted this issue in a way no government has been able to do.”