“Twenty-year-old Meghan Trainor blew up this summer with "All About That Bass," a positive-body-image bubblegum jam that claimed, "I'm bringing booty back/Go ahead, tell those skinny bitches that." Her debut major-label EP hooks similar trickle-down Beyoncé empowerment themes to sugary doo-wop and girl-group melodies. "Title" demands her boy put a name on their relationship status. On "Dear Future ”