Earlier this year Ed Sheeran convinced a jury that he didn't rip off Marvin Gaye's `Let's Get It On.' By way of contrast, Pharrell Williams and Robin Thicke earlier failed to establish that `Blurred Lines' wasn't a copy of Gaye's `Got to Give It Up.' But could automated algorithms bring a new objectivity to music copyright infringement decisions, limiting the number, scale and expense of court cases? Nights talks to Musicologist Dr Patrick Savage of the University of Auckland about a new study.