You can read the entire repertoire for Hartley's orchestra here on ET:
The White Star Line Repertoire is a list of 341 waltzes, marches and other selections played by orchestras on White Star Line ships including the Titanic.
www.encyclopedia-titanica.org
The orchestra wasn't just for the
first class passengers. They also played for the second class passengers too.
There was a piano provided for the use of third class passengers in their general room IIRC. Third class passenger Eugene Daly won admiration from his fellow passengers for performing beautiful Irish airs on deck with his uilleann pipes.
Hymm services were held in first and second class on April 14th.
As they rowed steadily toward the
Carpathia, I believe (correct me if I'm wrong) it was Lowe's boat fourteen in which the occupants sang "Pull For The Shore Sailor" to buck up their spirits.
Now I wasn't there - but I suspect that the crew in their respective mess rooms may have enjoyed singing the popular songs of the music hall's. Songs made famous by stars of the day such as George Robey, Marie Lloyd, Harry Lauder etc. It's perfectly possible they enjoyed a few old fashioned sea shanties too. We'll just never know.
The firemen and trimmers according to Frank Goldsmith (who was somehow able to sneak a peak at them) sang as they worked. Young Goldsmith may have been a bit too young to understand some of the rather salty words and phrases in their songs though !