NEW YORK (AP) _ Though turned down flat, a music promoter said today he hasn’t given up on persuading the three remaining Beatles to perform at Shea Stadium this summer.

``I’m not stopping here,″ promoter Sid Bernstein said. He was responding to a statement Thursday from Paul McCartney’s office rejecting his $500 million offer for a 20-minute concert on Aug. 23. The performance would have taken place 30 years after the Beatles’ last show at the stadium.

``The Beatles aren’t interested,″ McCartney’s statement said. ``Money is not an issue. We wouldn’t do it for twice as much. The answer is no.″

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But Bernstein, who promoted the Beatles’ 1966 appearance, said he hopes to persuade the performers that ``this isn’t about money but a magical moment in all of our lives that we can realize now.″

He said he would suggest giving concertgoers seeds to plant trees for peace. And he claimed the concert could generate a billion-dollar trust fund for charity.

Bernstein said he could probably raise the funds through international television rights, a film and recording of the event, merchandise and ticket sales. He claimed to have located one sponsor, but would not identify him.

``The message would be heard around the world,″ he said. ``With all due respect, no three world leaders could get the kind of reaction as these guys.″

McCartney, George Harrison and Ringo Starr reunited to record a pair of new songs for their recently released ``Anthology″ albums, adding to vocals recorded by John Lennon before his death in 1980. But they have repeatedly refused to do a reunion concert.

In March, the Beatles said no to a $225 million offer for a concert tour of North America, Europe and Japan.