I used this for my party's final fight. They failed to contain a gargantuan kaiju dragon (from Ryoko's Guide) from rampaging and it completely destroyed the city they were in, so they had to confront it to prevent it from killing more people. The lead up to the battle was dead silent, I just had the sound of people screaming and the dragon's roars in the distance. Once they got close enough, the monster noticed them. They stared down for a little while, I let the party collect their thoughts... then they told me they were ready. I faded the bg ambience and gave them a full 10 seconds of dead silence as I narrated the kaiju honing in and getting mere feet away from the cliff they were standing, until they were at eye level. Then I played one loud, final roar (0:48 of this video: kzfaq.info/get/bejne/aJ-piMxyv6urmY0.html) and started this song right after. Everyone was literally shaking with excitement, me included. One of my proudest DM moments ever.