He never 'sang' to the police, but it turns out Al Capone had a song in his heart. All it took was a stint in Alcatraz prison to bring it out.

Now, more than 70 years later, the tender love song that the ruthless crime boss penned while sitting in the now-defunct California prison is being recorded and released on CD. And an inscribed copy of the music and lyrics to Madonna Mia is up for sale at US$65,000.

"It's a beautiful song, a tearjerker," said Rich Larsen of caponefanclub.com, who helped line up musicians and singers to record it.

The story of Madonna Mia begins in a cell in Alcatraz, where 'Scarface' was sent for tax evasion. Capone, who loved opera and jazz, and whose nightclubs hired musicians like Louis Armstrong, apparently had time to kill.

Capone's influence on music

Capone could read music and liked to play a banjo and a mandola, which is like a mandolin, only bigger. According to Larsen, who is working on a documentary about Capone's influence on music in the 1920s and '30s, the gangster begged the warden for permission to form a small band. The warden relented, the inmates sent away for instruments, and Capone made music behind bars.

Enter Vincent Casey. As part of his training to become a Jesuit priest, Casey would visit Alcatraz to offer spiritual counsel to prisoners in the 1930s. Casey and Capone talked in the mobster's cell every Saturday for two years, becoming good friends, said Casey's son, Mike Casey, a retired airline employee in Temecula, California.

"My father spoke very highly of him," Casey said. "It was incredible. This criminal murdered many people, but he told me when you got to know the man in the cellblock on Alcatraz, he was very humble and polite and courteous."

One Christmas, Capone presented his friend with a piece of sheet music. The lyrics told of a man's undying love for his 'Madonna Mia'.

"With your true love to guide me, let whatever betide me, I will never go wrong," Capone wrote. "There's only one moon above, one golden sun, there's only one that I love, you are the one."

The way Larsen tells it, the gangster who supposedly orchestrated the 1929 St Valentine's Day Massacre — in which his henchmen pulled machine guns from violin cases, incidentally — was a religious man. So the song might be about the Virgin Mary.

But Larsen thinks it is more likely that the song was Capone's valentine to his wife, Mae, who stuck by him, even after he went to prison and suffered the effects of syphilis, the disease that led to his death in 1947.

Sentimental value

The sheet music is inscribed, "To my good friend Father Vin Casey with the best in all the world for a Merry Christmas always for you. Alphonse Capone."

Casey took it home. Never ordained, Casey married and before he died in 1960 showed the gift to his son, suggesting that it may have more than just sentimental value.

The younger Casey sold the sheet music to an auction house, though he would not say for how much. But today, that piece of paper is on sale for US$65,000 at the Boston location of Kenneth W. Rendell, a dealer of historical documents.

For the past eight months or so, Larsen and a producer have been recording the song, with two singers — a man and a woman — backed by a mandolin, accordion, violin, piano and stand-up bass. Larsen said the CD should be on sale next month.

The song, a clip of which was obtained by The Associated Press, sounds like a traditional Italian love song that was popular at the time.

Capone's love of music was evident right up to the end of his life. In his research for a book about Capone, Chicago author Jonathan Eig found that even when Capone's mind was ravaged by syphilis and he was paranoid and delusional, he continued to play his mandola.

Stabbed in the back

That doesn't mean that Capone totally abandoned his preferred way of settling scores.

"At one point he got into a fight with an inmate named Lucas, and Lucas stabbed him in the back," Eig said. "Capone responded by hitting him in the face with his banjo."

Eig joked: "This may be the only time a gangster actually had an instrument in his instrument case."

Lyrics to Madonna Mia

In a quaint Italian garden

While the stars were all aglow

Once I heard a lover singing

To the one that he loved so

In that quaint Italian garden

'Neath the starry sky above

Every night he'd serenade her

With his tender song of love

Madonna mia

You're the bloom of the roses

You're the charm that reposes

In the heart of a song

Madonna mia

With your true love to guide me

Let whatever betide me

I will never go wrong

There's only one moon above

One golden sun

There's only one that I love

You are the one

Madonna mia

This I vow here before you

Till the end I'll adore you

Madonna mia

Once again I see that garden

Many years have hurried by

I can see that sweet Madonna

There's a teardrop in her eye

For her soldier has departed

Left his loved one with a sigh

She said, "I will wait forever."

As he sang this last goodbye.

Madonna mia ...