With its upcoming seventh CD, “Heartthrob,” Canadian twin-sister act Tegan and Sara might have composed the ultimate breakup album. They did it in an unusually startling style by setting aside their acoustic guitars for new wave-school synthesizers on Greg Kurstin/Mike Elizondo-helmed tearjerkers such as “Goodbye, Goodbye,” “I Was a Fool,” “I’m Not Your Hero” and “How Come You Don’t Want me.” Read More