DESCRIPTION:
A very nice WW2-esque sounding song used in the (really cool) CGI trailer "Heroes" for the game War Thunder. This video is purely the song - no sound from the trailer itself.
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Created by a group called "93 steps." Apparently they've done quite a bit of trailer soundtracks for games you've probably heard of (World of Tanks & Warplanes). Their website here:
http://www.93steps.com/
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The War Thunder: Heroes specific page, where you can purchase the song (via SoundCloud).
http://www.93steps.com/portfolio/war-thunder-heroes-trailer/

Also there, is a statement about the project itself:

"Sometimes happen that emotions drive us in places where only immagination is the real protagonist, with feelings that moves you no matter how relaxing or anxious they may be.

This happened when we were asked to compose an original soundtrack for a video pretty unique in its genre, with a stunning, photo-realistic computer graphic and capable to inject you harmony and sadness at the same time.

With that video, partially in slow motion and partially focused on the action, the client asked for us for a classical and vocal composition inspired by the musical current of the 50s and 60s.
We had the opportunity to collaborate with a talented singer who sang our own lyrics, and with our reliable musicians to record a real small string ensemble, embellished by a woodwinds quartet.

Making a song like this wasn't at all an easy task, but the emotions that arose from the movie helped us composing it with a constant inspiration."
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The original trailer:
http://www.youtube.com/watch?v=0sfA-NsbzJY