What does it take to create a work of art with another person? Talent, inspiration, hard work. But the most important part of the equation may be whether the creators hit it off and find themselves on the same wavelength. James Lapine found his best collaborator in Stephen Sondheim, one of the greatest theater composers ever. Their first work together turned out to be a Broadway show called Sunday in the Park with George. They went on to create Into the Woods and Passion. I talk to James Lapine about his relationship with Sondheim, who died suddenly last year, and the art of thinking outside the box. “Now What?” is produced with the help of Steve Zimmer, Annika Hoiem and Alex Wolfe. Audio production is by Nick Ciavatta.