Okay, just got home. Here are my notes.
Opening scene - brutal, chaotic, overwhelming
Aftermath - Gentle, Bird Box-y piano
Traffic stop - Deep, huge, massive synth repetitions, incredible tension.
Pod Interrogation/Raid - Started off like 'The Background World' but then evolved and got harder, then even harder with more guitars and electronics. Fucking fantastic music for these scenes.
Pre-credits - soft, beautiful prepared piano and something like a xylophone.
Credits - High energy synthy, trademark action-y TRAR.
Overall, nothing really broke the mold, a lot of Bird Box/Vietnam War vibes, although some of the sounds and synths were not as typical for them (I'm thinking mostly of the Halloween-type synths, which were very 70's) but the action scenes (Interrogation/Raid) were very well matched.
But.
The opening scene...
That was THE BEST pairing of Reznor and Ross' music with imagery that I have ever seen. The first five minutes of Watchmen will be spoken of for a long time.
Also! At the Q&A, someone asked about the score. Damon Lindelof answered, here's the transcript:
I have a rule about composers, that they're different from show to show...one of the things that I didn't know about Watchmen was what it was going to sound like and every time I imagined what it would sound like, it sounded like Trent Reznor and Atticus Ross. So I called HBO and said "these guys have never done TV before but do you think we could take a shot at them?" and Francesca Orsi said "that is so weird, Trent and Atticus' manager called this morning and they were asking about Watchmen". One of the first things Trent said was "so...are you doing the squid?" and I was like "oh this guy is all the way in". They wrote a lot of this music and sent it to Nikki (director of some of the episodes) and I before we started shooting. They said "we read the script and these are some of the things we were thinking". I'd say close to 80% of the music they wrote before we even shot is in the pilot. We were just trying to make stuff worthy of those guys, they're amazing.