For popular music fans, even if you aren’t a Nilsson fan (I am). A singer-songwriter whose voice was like a musical instrument. He wrote the sublime (“Without Her”) and the ridiculous (“Put de Lime in de Coconut”) before the rock lifestyle drove him off a cliff. I learned from the film that “One” (covered by Three-Dog Night) was inspired by a busy signal on his phone. (You can hear the D-minor chord going chink-chink-chink with the same meter.) Now THAT’s cool.