This week’s shocking loss of composer James Horner has upended the entire film music world. Everyone I know is still in disbelief. Many are using social-media platforms to eulogize him and recall their favorite scores. On Monday I wrote the obituary for Variety, after word came that his plane had crashed in Ventura County, Calif., and that he had not survived. And today I’ve added some personal thoughts and historical perspective in an appreciation piece dotted with photos of him taken over the past three decades. I liked James very much; we first met in the aftermath of his Titanic success, and over the years we spent hours on the phone discussing his subsequent work.