“We fall to Earth together/The crowd calling out for more,” goes a couplet on this four-track EP by the remaining Macs (Christine McVie sits out). Note to band: That doesn’t mean y’all have to answer. But if their first release of new music in a decade isn’t replacing any classics, the voices of Lindsey Buckingham and Stevie Nicks can still bring chills. The gem is “Without You,” a breezy Nicks-written folk rocker from the couple’s pre-Mac project Buckingham Nicks: Largely acoustic, with twined harmonies, its chords twist and resolve like a sun-dappled mobile on a breezy day. And we confess: Hearing the ex-lovers put words in each other’s mouths remains as fascinating as ever.