This would bring insanity to Brooklyn's Prospect Park.

Michael Lang, who helped put on the famous upstate 1969 festival, is hoping to stage a massive Woodstock 40th anniversary concert in Prospect Park's Long Meadow this summer -- if he can find enough sponsors.

"It's big, it's convenient. There's public transportation - and Brooklyn's cool," said Lang, 64. "I'd love to do it. But it's been a very tough year."

Parks Commissioner Adrian Benepe confirmed the city is in talks with Lang about the event.

If the money comes through, Lang is hoping to attract up to 150,000 people and feature a mix of Woodstock legends like Crosby, Stills and Nash, and Neil Young, as well as newer bands that fit the vibe, like Dave Matthews and Phish.

Last summer, soprano Angela Gheorghiu and tenor Roberto Alagna performed together in Brooklyn’s Prospect Park with the Metropolitan Opera Orchestra and Chorus, drawing a crowd of about 50,000.