A Chequer-Board of Nights and Days

It's a new Da Vinci code, but this time it could be for real.

 An Italian musician and computer technician claims to have uncovered musical notes encoded in Leonardo Da Vinci's "Last Supper," raising the possibility that the Renaissance genius might have left behind a somber composition to accompany the scene depicted in the 15th-century wall painting.

"It sounds like a requiem," Giovanni Maria Pala said. "It's like a soundtrack that emphasizes the passion of Jesus."

Painted from 1494 to 1498 in Milan's Church of Santa Maria delle Grazie, the "Last Supper" vividly depicts a key moment in the Gospel narrative: Jesus' last meal with the 12 Apostles before his arrest and crucifixion, and the shock of Christ's followers as they learn that one of them is about to betray him.

Pala, a 45-year-old musician who lives near the southern Italian city of Lecce, began studying Leonardo's painting in 2003, after hearing on a news program that researchers believed the artist and inventor had hidden a musical composition in the work.

"Afterward, I didn't hear anything more about it," he said in an interview with The Associated Press. "As a musician, I wanted to dig deeper."

In a book released Friday in Italy, Pala explains how he took elements of the painting that have symbolic value in Christian theology and interpreted them as musical clues.

Pala first saw that by drawing the five lines of a musical staff across the painting, the loaves of bread on the table as well as the hands of Jesus and the Apostles could each represent a musical note.

This fit the relation in Christian symbolism between the bread, representing the body of Christ, and the hands, which are used to bless the food, he said. But the notes made no sense musically until Pala realized that the score had to be read from right to left, following Leonardo's particular writing style.

In his book -- "La Musica Celata" ("The Hidden Music") -- Pala also describes how he found what he says are other clues in the painting that reveal the slow rhythm of the composition and the duration of each note.

The result is a 40-second "hymn to God" that Pala said sounds best on a pipe organ, the instrument most commonly used in Leonardo's time for spiritual music. A short segment taken from a CD of the piece contained a Bach-like passage played on the organ. The tempo was almost painfully slow but musical.

Alessandro Vezzosi, a Leonardo expert and the director of a museum dedicated to the artist in his hometown of Vinci, said he had not seen Pala's research but that the musician's hypothesis "is plausible."