The soundtrack of this film, composed by Hans Zimmer, is phenomenal. Director Ron Howard commented that "Like every other facet of this movie, the score for The Da Vinci Code demanded a range of textures that recognized and reinforced the layers of ideas and emotion, which unfold as the basic story does." Well, it does. The cue of Chevaliers de Sangreal, the main theme of the film, is found during the climax of The Da Vinci Code, when Landon at last discovers the solution to the mistery of the Holy Grail, following the Rose Line across Paris to the La Pyramid Inversée in front of the Louvre. This piece develops over a simple chord progression, i - III - VII - v, at first in Dm and then transposed in Gm. The main melody is carried out by a solo cello in the first bars, while in the background the violins are playing ostinato along with a soft synth: in the distance, the tubular bells emphasize the melody, giving a sense of sacredness to the whole piece. Then, as Landon arrives at the Pyramid Inversée, the orchestration starts to build up: the violins play the main theme, while the cello plays some descending notes. Now we get to the part of the revelation: Mary Magdalene is buried beneath the Louvre. As Landon kneels, a choir is introduced. At first we hear just the powerful voice of some male tenors, but, as soon as the camera frames the coffin, a female soprano starts singing: it's like Hans Zimmer wants us to hear the voice of Mary Magdalene herself. 

This piece sums up the nature of this fantastic film: it's mysterious, emotional, almost a religious piece. As I first heard it I immediately knew it would have become one of my favourite soundtracks of all time. My only regret is that I didn't get to see the film in the theater (I was only 6): that would've been fucking amazing.