Scores and possibly even hundreds of songs have been written about the sinking of the Titanic over the past century, most focusing on the people who drowned. But David Olney thought to write his “Titanic” from the perspective of the iceberg that sank it. Taking that viewpoint takes a true streak of perversity, which is Olney’s gift as well as curse – gift because it makes him one of the thorniest and most interesting Americana singer-songwriters out there, and curse because his quirkiness has not exactly lifted him to the masses. So show your good taste and be there when Olney plays The Cary theater on a Friday night bill with another stellar singer-songwriter, Blue Ridge Mountain man Malcolm Holcombe. Showtime is 8 p.m., and tickets are $20-$25. See thecarytheater.com for details.