At a dusty studio space in an industrial corner of Los Angeles, LL Cool J bounced and vibed in black satin and bulging, size 13 Balenciaga boots.

The actor and rap luminary was filming a video for a sexy track, “Proclivities,” from his new album — but he wasn’t in front of the cameras, or rehearsing. He was just cheerfully shooting the you-know-what, with a late night of production ahead of him. Background players in feathered dresses floated by; his security circled. He did a little dance, demonstrating the inspiration for another song. He walks with a swagger and stands with a spring, too much rhythm in his 6-foot-3 frame to keep still. “Making fantasies happen,” he said, grinning, taking all of it in.

LL Cool J is 56, and has been a hip-hop eminence for 40 years: His whole life is a stretch into realizing the improbable, including a sneakily successful pivot into network television. Even before adulthood, he strode with a preternatural confidence in his abilities, and a willingness to dig into the work. His rap career is not now — and, to hear him tell it, has never been — about the money, the trappings of celebrity or the cultural prestige.