The music done absolutely nothing for me in that trailer. Sounds like someone just put their favourite song over the trailer so we all had to listen to it.
Some nice visuals later in the trailer, but the first half was gash.
I'd actually claim the opposite. Didn't they end last season with the breaking of the old (AI controlled) world order?
So the trailer starts with scenic images, that most people probably associate with freedom, and "it's just a perfect day" lyrics.
"when it gets
dark we go home" introduction William / man in
black
"feed animals in the zoo", we see the bird's eye perspective shot, where people walk orderly on a straight and narrow concrete path - like well trained animals in a cage
"you made me forget myself, I thought I was someone else, someone good" that's like every other character arc in Westworld, also maybe a reference to the hopeful opening shots
And then they turn up the volume, playing the cheerful lyrics against the violent images to create a cynical contrast and they complete that by gradually replacing the music with disturbing sound
"I'm glad I spent it with you" - we see a shot with Clementine with another woman that's terrified of her
"you just keep me hanging on" - looks like shots of William/Dolores clones waking up
until they close with "you're going to reap just what you sow", which is the very core of Westworld's philosophy (these violent delights will have violent ends)
I can't think of another show that's so effective with its choice of music.