Titanic objects part of 2018 Victoria & Albert museum exhibit
Royal Albert Hall, May 24, 1912
Edward Elgar, Thomas Beecham, et. al. conducting 473 musicians ("the greatest professional orchestra ever assembled") including members of the London Symphony Orchestra which "had been booked on the Titanic to take them for a three week tour of the US and Canada, but due to rescheduling of concerts, they had to leave a week earlier than planned."
The audience of 7750 heard works of Mendelsohn, Chopin, Wagner, Tchaikovsky, Elgar and Sullivan. At the conclusion of the program, when
"the whole auditorium rose like a congregation to sing Nearer My God to Thee...nearly everyone present was in tears."
(Wait for the music, which starts at about 0:28 in this video.)
"Merry Widow Waltz" and other popular melodies of a century ago. The entire Rhino Records CD, featuring Ian Whitcomb and five other musicians playing in reasonably contemporary arrangements and style, and the accompanying booklet, can also be recommended.
Video excerpts and photos.
A short list of Titanic books and a text excerpt are here