The background music of the Infernal Affairs song starting from the rooftop part is called "White Stone", which is pure music without lyrics.

Song: White stone

Singer: Secret Garden

Lyricist: Secret Garden

Composer: Secret Garden

Album: "White Stone"

Type: Accompaniment/Pure Music

"Windancer" starts with a plucked string instrument with a mysterious tone, and then uses a flute to play a melodious melody. The melody is very ups and downs, like the mist in the valley gliding sharply in the wind. The magical plucked strings are still cooperating. In addition, the addition of electronic sound effects and a slightly faster melody that is as smooth as flowing water establishes the extraordinary atmosphere of the whole piece. It has a magical and modern style with the simple essence of European folk music. Then the oboe plays the main melody that seems to be gently rotating. The gentle and roomy oboe playing and the waves of accompaniment melody indicate that the real theme is coming. Sure enough, the violin's energetic main melody performance and the accompanying tight rhythm accompaniment appeared. The climax of the whole piece of music, the passionate dance of the wind in the mountains and highlands, officially started from here. This meandering enthusiasm continues until the powerful ending of the piece. In the latter part of the piece, the violin and oboe's full-force ensemble of the main melody even presents a timbre similar to that of Scottish bagpipes. The horn playing in the middle and latter part of the music increases the power and intensity of the music, as if injecting a solemn national spirit into the music.