If Baby Driver taught folks anything this year, it’s that finding just the right song at just the right moment is like kismet. You can’t predict it, but when it happens you have to let it wash over you. Typically these jolts of joy occur to individuals listening alone, but every so often they happen to the public at large. Maybe it’s a music cue in a movie, maybe it’s Lady Gaga premiering a new track at Coachella, maybe it’s...