Megan and Liz stop by the Idolator Studio in New York City and sing your requests gathered on Twitter — including Demi Lovato's "Heart Attack," Katy Perry's "Unconditionally," Aly & AJ's "Potential Breakup Song" and Taylor Swift's "All Too Well." Megan and Liz are an American pop girl duo composed of fraternal twin sisters, Megan and Liz Mace, from Edwardsburg, Michigan. They are both songwriters, and Megan is their guitarist. Their debut album, "Look What You Started," is expected to be released in the February of 2014.