Canadian folk rock legend Neil Young said he has lost all hope that music can change the world, as he presented a documentary about his 2006 anti-war concert tour at the Berlin film festival on Friday.

"I know that the time when music could change the world is past. I really doubt that a single song can make a difference. It is a reality," Young told reporters.

"I don't think the tour had any impact on voters."

But the silver-haired frontman of the sixties supergroup Crosby, Stills, Nash and Young nonetheless dealt US President George W. Bush a stinging, back-handed insult and said his own "naive" urge to make people think remains intact.

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"What is wrong with George Bush? That would take a really long time. Let's talk about what is right with him, it is a much shorter answer.

"He is a very good physical specimen. He shows that a man his age can stay in physical condition," said Young, who is 62.

He made no distinction between the Vietnam War, during which CSNY first earned their reputation as political activists, and the US-led war in Iraq which their tour condemned with songs like "Let's Impeach The President".

"It is all the same war and it hurts everybody. It's a wrong way to solve a problem," he said, adding that Americans were deluded if they thought they were liberating Iraq.

"We just don't have to go and spread democracy around the world."

Young said he deliberately included interviews with unimpressed critics and soldiers who served in Iraq and Afghanistan in the documentary of his band's "Freedom of Speech" reunion tour, which earned them both praise and death threats.

"Otherwise I thought it would just feel like a bunch of old hippies. And nobody would care. I would not, I would have left," said Young, who directs his films under the pseudonym Bernard Shakey.

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