THE SOUND OF MUSIC: Pharrell Williams, rarely seen without wearing one of his treasured Chanel sautoirs, is taking his relationship with the French brand one step further. WWD has learned that Karl Lagerfeld directed the musician in his latest movie, to be screened in tandem with the Paris-Salzburg pre-fall collection the designer plans to parade on Dec. 2. Filming took place in a Paris studio last week, with Cara Delevingne and six-year-old Hudson Kroenig among Williams’ costars and dance partners, Lagerfeld said. Chanel’s next Métiers d’art collection is to be unveiled at the Schloss Leopoldskron, an 18th-century Rococo palace that is considered one of the finest in Austria.