You can see Jamie talking in a short film about the musicians on board from 31:56, 57:13 and again from 1:22:17
Here's the transcript of Jamie's parts in the film:
The first class passengers aboard the Titanic would have expected a huge range of music. At the time, the things that were popular were musical numbers, light opera, ragtime, which is an early form of jazz) so the musicians had to know a huge amount of music.
Some people when they are frightened, they run and they panic and I think others retreat to what makes them feel safe, what makes them feel human. For musicians, doing music for the love of it, music is what makes you feel safe, what makes you feel human. So I imagine playing music was not only a comfort on board the ship but a huge comfort for them when they didn't know if they were going to live or die.
500 musicians from many different orchestras all arrived to play at the Royal Albert Hall for this. They had an extraordinary array of conductors, Elgar was one of the conductors and the proceeds from that concert was to help families to deal with their loss.