There are tributes/references to classic films like “Singin’ in the Rain,” “Rebel Without a Cause,” and “The Umbrellas of Cherbourg,” but this movie is not derivative. The storyline is deceptively simple, but the specificity of the detail, depth of understanding, and beautiful performances create true movie magic. “La La Land” is narratively ambitious and emotionally resonant, with a final ten minutes that are pure, wistful poetry. Chazelle and Hurwitz understand that some feelings are just so big they have to be sung and danced. And this movie made me so happy I wanted to create a musical number of my own. But I settled for watching this more two more times instead.