Pharrell Williams on ‘Piece by Piece’ and the end of the Neptunes [Video]

Pharrell Williams is sitting with a dozen or so kids around a doughnut-shaped table filled with plastic Lego bricks. As a camera crew records their interactions, the 51-year-old singer, rapper, songwriter and producer asks each child to tell him where they like to learn; the kids answer politely, though nearly all of them are paying more attention to the brightly colored structures they’re busy assembling. That hardly bothers Williams: After all, he’s here at a brand-activation event in Hollywood on a recent afternoon to promote his new Lego movie of a biopic, “Piece by Piece.”

Directed by Morgan Neville— known for the Oscar-winning “20 Feet From Stardom” and for “Won’t You Be My Neighbor?,” about the life and work of Fred Rogers — “Piece by Piece” traces Williams’ journey from a Virginia Beach housing project to the pinnacle of pop music as the co-creator of sexy, funk-slicked hits by the likes of Britney …