0:00-0:15 Incidental. Descending clarinet solo followed by active strings. Leia: “Find a new base.”
0:15-0:49 Ren's Power motive as The First Order arrives, tracked through hyperspace
There appears to be some major editing in this track because there are discrepancies between the film and the soundtrack. In the film, the desperation motive is heard between the arrival of The First Order and the Resistance March below. That appears to have been edited in from another part of the music as it's absent from the soundtrack.
0:49-0:59 Resistance March (strings, d minor) as resistance scrambles a defense.
0:59-1:22 Resistance March (brass, E-flat minor). This was not used in the film as far as I can tell.
1:22-1:42 Desperation motive. This was used in the film.
1:42-1:46 Ren's Power motive, trombone. Omitted from film.
1:46-1:50 Ren's Power motive, horn. Included in film.
2:05-2:15 Leia's theme, D-flat major, horn, 1st phrase only
More editing here - a LOT more:
In the film, there's a prominent ascending then descending triplet line in the trumpets, but it's not heard on the soundtrack. I wonder where that came from...?
Also, in the film, Ren's power motive is again heard fortissimo by horns just before Ren doesn't fire on Leia. But that's not heard in the soundtrack. I suspect in this case, the editors copy/pasted from 1:46.
And finally, in the film, the first phrase of Leia's theme is heard in the strings in between Ren's power motive and the pause as Ren hesitates. Again, that's missing from the soundtrack.
2:23-2:34 Orchestral crescendo leading to dramatic pause as Ren hesitates shooting Leia.
In the film, this sequence took a few minutes as we see Ren hesitate, then his colleagues fire anyway, the bridge explodes, and we see Leia sucked out of the ship into empty space. But in the soundtrack it's much faster.
2:34-2:56 Leia's theme (piano? harp? both? I can't quite tell), 1st & 3rd phrases, as Leia saves herself.
2:56-3:06 Force theme, C# minor, strings, 1st phrase only
3:06-3:29 Leia's theme, strings with horn answers, E Major
3:29-3:35 Force theme, first phrase, horn, e minor, as Leia is safe
3:443:58 Rey's melody, quietly and slowly by harp, 1st and 2nd phrases elided, as Leia drops Rey's beacon and Finn picks it up.
The Music of Star Wars
These posts will help focus and develop my analyses of John Williams' film scores.