Tens of thousands of people have protested in Norway against the anti-immigration views of Anders Behring Breivik, as they sang a peace song derided by the mass killer.

A crowd of around 40,000 in the capital Oslo chose ‘Children of the Rainbow’ which celebrates the type of multi-cultural society Breivik has said he despised and one he dismissed during his trial as Marxist propaganda.

Thousands of Norwegians also held similar musical demonstrations in squares across the country.

Breivik mentioned the tune as an example of how he believes “cultural Marxists” have infiltrated its schools and weakened its society. He claimed the song had been used to brainwash the country’s youth into supporting immigration.

‘Children of the Rainbow’ is a Norwegian version of a Pete Seeger song (‘My Rainbow Race’) that the confessed mass killer claims has been used to brainwash the country’s youth into supporting immigration.

The Norwegian lyrics:

“A sky full of stars, blue sea as far as you can see

“An earth where flowers grow, can you wish for more?

“Together shall we live, every sister, brother

“Young children of the rainbow, a fertile land.”

Seeger’s lyrics in the original version have a similar message of living together in harmony:

“One blue sky above us, one ocean lapping all our shore

“One earth so green and round, who could ask for more

“And because I love you I’ll give it one more try

“To show my rainbow race, it’s too soon to die.

Breivik has admitted carrying out twin attacks on July 22 last year – including a bomb he planted outside government offices in the capital, which killed eight people.

The other atrocity was a shooting rampage at the ruling Labour Party’s annual youth camp on Utoya island that left 69 others dead, mostly teenagers.

He said he was targeting the party because he claims it has betrayed the country by opening its borders to Muslim immigrants.

But he has denied criminal guilt, saying he did so in defence of Norwegian ethnic purity.

After singing, people in Oslo then walked along several streets to the court where Breivik is on trial, close to the site of the bombing.

Most left roses, a symbol of the Labour Party, on the security fence around the building.

The musical protest came on the ninth day of Breivik’s trial, where survivors of the two attacks began giving evidence.

They included a young woman nicknamed “miracle girl” who described how she had survived the bombing of the government offices against all the odds.

Anne Helene Lund, 24, said she had been working at a reception desk when Breivik parked a big white van outside and lit a seven-minute bomb fuse.

She was just seven metres (23ft) from the explosion, and afterwards was in a coma for a month. When she woke up she had lost her memory, and could not even remember the names of her parents.

Ms Lund suffered head and brain injuries, her legs and thighs were crushed, she had lots of cuts and still has glass shards stuck in her body.

She told the court: “The head injury I got caused me to fall into a coma, and as a consequence I don’t remember anything from that day, and very little from 2011.”

Her father Jan Henrik Lund said: “She was labelled ‘miracle girl’ because the doctors said it was almost impossible to survive something like this.”

Breivik’s mental state is the key issue of the trial:

Two of the four official forensic psychiatrists have declared him criminally insane while the others say he is of sound mind, but with a narcissist character.

If found guilty and sane, he would face 21 years in prison. He could be held longer if deemed a danger to society.

If declared insane, he would be committed to compulsory psychiatric care.