An accomplished English violinist, Hartley led the orchestra aboard the Titanic. He had previously performed with the Huddersfield Philharmonic Orchestra and the Bridlington Municipal Orchestra. In 1909, Hartley joined the Cunard Line, playing on notable ships such as the RMS Lucania, RMS Lusitania, and RMS Mauretania. By April 1912, the music agency C.W. & F.N. Black had enlisted him as the bandmaster for the Titanic, where he led the ship's orchestra during its ill-fated maiden voyage. After the tragedy, Hartley's body was recovered and buried in Colne, Lancashire. The opening notes of 'Nearer, My God, to Thee', which the band played aboard the Titanic to calm passengers, were also played at his funeral.