Thanks to ‘All Star’ to ‘Hallelujah,’ the animated blockbuster’s soundtrack has maintained a quietly rich legacy. The people behind the film—and musicians behind its songs—break down how it came ...

“Hallelujah: Leonard Cohen, a Journey, a Song” is a documentary about the Leonard Cohen song “Hallelujah,” and if that sounds like a lot of movie to devote to one song — well, “Hallelujah” is a lot of ...