LONDON -- A song written by former Beatle Paul McCartney in the aftermath of the September 11 attacks is set to be released as a charity single, his spokesman said on Friday.
"Freedom" will come out just a week after his first charity single "From A Lover To A Friend" hit the shops to raise funds for New York's emergency workers.
It is being rush-released due to popular demand, said publicist Geoff Baker.
"Freedom" was first performed at the star-studded Concert For New York at Madison Square Gardens on October 20.
Afterwards the singer was besieged with requests from fans wanting to buy the single, Baker said.
It will be released in Britain next week and in the United States either then or the following week.
McCartney, whose father had been a volunteer firefighter in Liverpool during World War Two, witnessed the kamikaze air attack on New York's World Trade Center and said "Freedom" had been his immediate response.
"At the time the World Trade Center was attacked (fiance) Heather (Mills) and I were on a plane waiting to take off from New York and we witnessed the last moments of the Twin Towers," he said in a statement.
He added: "We all have a right to a free life and we have to fight for that right -- and because we're such freedom lovers, I wrote this song at Heather's suggestion.
"We hadn't reckoned on this demand for 'Freedom' but as that's what people want we're getting it out fast to try raise more money for the firefighters and police of New York."
Like "From A Lover To A Friend," all proceeds from the sale of the single will go to the Robin Hood Foundation, which distributes funds to families of the victims and to New York firefighters and police.