Moar work?
Moar work?
"Law and Order", lots of places have had that, Russia, North Korea, Saddam's Iraq.
Laws can be made to enforce order of cruelty and brutality.
Equality and Justice, that is how you have peace and a society that benefits all.
The transition from Sara to Yogg-Saron's voice:
"I am the lucid dream, the monster in your nightmares, the Fiend of a Thousand Faces, Cower before my true form! BOW DOWN BEFORE THE GOD OF DEATH!!"
https://m.youtube.com/watch?v=1_n1An8buCQ at 0:35
part of the joy of leveling in Barrens is the reward of entering Ashenvale for the first time and hearing that music.
Elwynn Forest music as my first char was a human.
As for quotes, random dwarf stuff as I spent a lot of time in Ironforge.

wotlk soundtrack, northrend (transport-night). 1:32 of music printed in my head. I had this on repeat for hours in so many occasions over the years...
https://www.youtube.com/watch?v=9RVuH7w73D0

For the best ambient music is without a doubt Howling Fjord for me, I feel so calmed while listening to it.
"So...the lights vaunted justice has finally arrived. Shall I lay down Frostmourne, and throw myself at your mercy, Fordring?"

Now I stand, the lion before the lambs... and they do not fear.
They cannot fear.

'You face Jaraxxus, eredar lord of the Burning Legion!'
'The sin'dorei reign supreme!'
'Now, your ARE prepared!'
And I can't believe noone's yet mentioned:
'Tempest Keep was merely a setback!'

For music, this.
For boss quotes, definitely "Rise mountains" from tectus
The music. Timestamps linked below.
- Thunder Bluff (fished in the pond while waiting for queue to pop for years)
- The majestic Blood Elf anthem
- Ulduar/Dwarf anthem
- The creepy cultish Twilight's Hammer theme
- MoP login music
- Wandering Isle
- Valley of the Four Winds
- That serene, melancholic Angler's Wharf music
- The heroic Xu'en/Shado-Pan theme
- That beautiful WoD Shadowmoon valley theme
- The forlorn Blackrock Foundry theme
- The majestic Warrior class order hall theme

Barrens ambience music.
"SLEEP. NOW."
"I remember you..."
"You face Jaraxxus"
Flesh trombone!
Pretty much every line from Jaraxxus.
Most of Bwonsamdi and Rastakhan's lines tbh
Everyone says they want good dreams, yet when they wake up, they've forgotten them, but... no one forgets a good nightmare!

Music? Grizzly Hills/Howling Fjord from Wrath, and Honor Hold's theme from TBC.
Sounds? I'm surprised nobody has mentioned the sound of a Fel Reaver getting close to you before. If you weren't paying attention and heard that, you were screwed.
How joyous to be in such a place! Where phishing is not only allowed, it is encouraged!
probably the worker orc's
But nothing as bad as this, took years to get out of my head (even after I stopped playing)