Los Angeles-based songwriter Lindy Robbins is one of pop's most in-demand topline writers. It's with good reason: Robbins' career has been defined by her omnivorous attitude toward pop. Whether she's working on big ballads like Demi Lovato's “Skyscraper” or slinky funk-pop jams like Jason Derulo's “Want to Want Me,” she writes melodies that get stuck in listeners' heads.