 In 1912–3 alone, over a hundred songs are known to have been produced in the US; the earliest known commercial song about "Titanic" was copyrighted just ten days after the disaster.Numerous pieces of sheet music and gramophone records were subsequently produced.In many cases they were not simply mere commercial exploitation of a tragedy (though that certainly did exist) but were a genuine and deeply felt popular response to an event that evoked many contemporary political, moral, social and religious themes.