Brando

Yes

They're real, and they're spectacular!   

By now it 100% is.

So my friend is doing the music for the second trailer coming out next month, and it's going to be about the Nazis from the first trailer, so they used the Nazi motif from TLC. He sent me a short preview of it:
 
 
indiana_jones_dial_of_destiny_trailer#2.mp3

One more:
 

Every trailer trope of the last 10 years was wonderfully combined in this Auralnauts video. Funny how the industry doesn’t realize it’s parodying itself now.
 
 

John Williams is my neighbor and I CAN confirm he wrote the trailer music. He played it for me at my birthday party a couple weeks ago.

John Williams is my neighbor and I CAN confirm he wrote the trailer music. He played it for me at my birthday party a couple weeks ago.

John Williams is my neighbor and I CAN confirm he wrote the trailer music. He played it for me at my birthday party a couple weeks ago.

John Williams is my neighbor and I CAN confirm he wrote the trailer music. He played it for me at my birthday party a couple weeks ago.

John Williams is my neighbor and I CAN confirm he wrote the trailer music. He played it for me at my birthday party a couple weeks ago.

Y'know, on a second listen, there might be some real instruments in there. I was wrong. JW confirmed.

John Williams is my neighbor and I CAN confirm he wrote the trailer music. He played it for me at my birthday party a couple weeks ago.

John Williams is my neighbor and I CAN confirm he wrote the trailer music. He played it for me at my birthday party a couple weeks ago.

I agree completely. I think, in an ideal world, the filmmakers would be more involved in the marketing and trailers would be an extension of the film. Matching music, tone, etc.
 
In reality, it's almost like... studios want films to appeal as general as possible. Quite frankly I also think it can come across sometimes as if the studios don't have faith in the final product to stand on it's own as it is. It's an odd disconnect where the marketing seems to read as if they think the movie won't appeal to enough of the general audience, but at the same time they are allowing the filmmaker to produce the final result we end up seeing. Feels a bit like an oxymoron. They do it though, because they want as many asses in seats as they can. Though, I think it's pretty clear these days how divisive films can be, especially with passionate fanbases. Honestly they should be to an extent. If a film wants to say something and mean something, it won't necessarily apply to or appeal to everyone. But they still want to get it in front of as many people as they can - so they distill and sometimes straight up lie to appeal to other kinds of viewers.
 
Since this thread is derailed anyway, I might as well mention an insightful conversation I had on this topic with Eric Alan, who was creative director at Nickelodeon Movies in the early 2000s and was heavily involved in the campaign for Lemony Snicket's A Series of Unfortunate Events.
 
I did a lot of research on that campaign and was grateful he spoke with me about it, because that campaign did a full 180 mid-way through the year and I was very eager to find out why.
 
For those that care for some detail and interesting anecdotes about film marketing in the early 2000s, I've nested this under a spoiler tag to not take up too much more space with this post by default.
 
And all this is from 2004. I can only image with the advent of spoiler culture things are even more wild - especially since they can now spend the time to render fake VFX shots just for the trailers.

All of the trailer music is obviously being written by Jacob Ceelasler, additional composer extraordinaire.

This feels like a Twitter thread, but without the Musk!

I’ve never seen anyone try and pull a ‘don’t you know who I am?!’ over trailer music before but this is the thread that keeps on giving 

The forum goes a little wild when Jay’s on vacation

I can confirm that JW composed the trailer music.  It sounds just like him 
 

I'm beginning to think that the OP is just frustrated that (astonishingly) JWFan hasn't telepathically attracted the composer of the trailer to reveal themselves.

... "and I said to Steven: I really think you need a better composer than I am for this trailer. And he very sweetly said: I know..."  
 
 

I'm not going to talk about quality or your ears for music, but I will say that in this day and age I would not assume trailer music was created by the film's composer just because the theme is included.
 
Countless Star Wars trailers have been done featuring the Force Theme that were not Williams.
Countless Harry Potter trailers featured Hedwig's Theme and were not scored by Williams.
Another example off the top of my head is the Charlie and the Chocolate Factory Main Trailer - while featuring tons of Elfman material, it was not done by Elfman, but was arranged by Aaron Zigman based on Elfman's early sketches.
 
I have put out the request, we'll see if the team responds.
 

I was the kazoo soloist on the score, and I can confirm the trailer music was not a part of the recording sessions.

I think it's a more likely scenario that the trailer music was written by the reanimated corpse of Ludwig van Beethoven than that it was written by John Williams.  I also haven't watched the trailer though.