Even in the bright new world promised by the original synth-poppers, heartbreak was unavoidable: Think of the genre’s greatest hit, the Human League’s desperate “Don’t You Want Me.” Junior Boys, then, have history on their side with So This is Goodbye, a lovely album that's destined to be remembered as a perfectly calibrated breakup album. Melding the elegance of classic ’80s styles with that of earlier eras — and offering a cover of the Sinatra chestnut “When No One Cares” in the bargain — Jeremy Greenspan and Matt Didemus seethe and sigh in a refined manner. All the glum emotional notes are struck, from the accusatory “Equalizer” to the resigned title track. Even when the lyrics skirt direct references to a split, as on “First Time,” the mood still holds.