Print A song needs to be exceptional if it’s going to occupy 10 minutes of a 69-minute movie. Steve McQueen’s “Lovers Rock,” one film in the Oscar-nominated director’s five-part “Small Axe” anthology series for Amazon Studios, tracks the course of a “blues party” thrown by first- and second-generation West Indian immigrants in an apartment in London in 1980. Midway through the night, one of the DJs plays Janet Kay’s 1979 hit “Silly Games,” a sweetly yearning ballad that typifies the sentimental variant of reggae for which the movie is named. What happens next constitu...