Research: Requiem for a Dream Trailer

- The trailer is only 1.34ish minutes long (teaser trailer length), but features at least 12 seconds relating to the production and distribution company.

- The style of the trailer is quite unconventional and very similar to the editing of the film. The fast montages and cuts are sometimes called "hip-hop montages", usually a rapid series of simple actions accompanied by related sounds effects. You'll see this in the trailer almost all the way through, like when the money levels rise in the box, or the syringe being plunged, for example. I really really like this, and might adopt something similar. I love the energy and chaos it implies.

- Aronofsky also uses split screen shots to show the different perspectives of the characters. This creates quite an objective narration. However, he also uses a lot of extreme close ups, which help us to identify to a greater degree with each individual character. 

- The soundtrack of the film was composed by Clint Mansell and performed by Kronos Quartet, which you can hear at the start of the trailer. This was played on instruments usually noted for their warmth, like cellos, but instead they are played to sound cold and eerie. This reflects the nature of the film - dreams are supposed to be warm, possibly happy, things, but Requiem for a Dream portrays them in quite a different and unsettling light.
This trailer mostly features another song from the film however, which is maybe more suited to the fast pace. The classical music features of the film's full length trailer. You can listen to it here;

Requiem for a Dream theme

And, if you like really epic remixes, here's the recording by a full orchestra that was done for the second Lord of the Rings film, although it was never used;

Requiem for a Tower