The “Blurred Lines” trial is underway in a Los Angeles federal courtroom. On Tuesday, Robin Thicke and Pharrell Williams were on hand for the start of the proceeding examining whether “Blurred Lines,” one of the biggest songs of the century, was improperly derived from Marvin Gaye’s “Got to Give It Up.” Thicke, Williams and Clifford Harris Jr., better known by his stage name T.I.