Track 15 is the first instance of a theme new to The Last Jedi: Admiral Holdo's theme. We hear this theme loud and clear just before Holdo attacks the First Order fleet at lightspeed. It might be heard in the film before this point (I'm going to see the film again on Saturday, so I'll be listening closely for previous iterations of Holdo's theme), but this is the first time we hear it on the soundtrack.
0:18-0:27 Incidental “Battle of Hoth”-like music. While similar music is heard in the film (on track 16 of the soundtrack), I do not believe this particular music is.
0:27-0:35 Holdo's theme, horns, B-flat minor as Holdo prepares for her lightspeed attack on the First Order fleet.
In the movie, Holdo's lightspeed attack is followed by several seconds of silence. Since this dramatic pause is missing from the soundtrack, I must conclude that the decision for silence was not made by John Williams.
1:05-1:08 start of Rebel Fanfare as BB-8 rescues Finn and Rose in the AT-ST
1:20-2:00 incidental bass drum hits (ala Rite of Spring) as Finn calls Phasma “chrome dome” and they duel.
The Music of Star Wars
These posts will help focus and develop my analyses of John Williams' film scores.