Blake Robinson is an Australian composer of music for film, TV and games. He writes:
Armies, Dragons and Rings was created by request, specifically for the final theatrical trailer music for The Hobbit 3. It heavily features [Howard Shore’s] “The Ring” theme in a new context.
Peter Jackson had a few final theatrical trailers created, and then spent some time making his decision. The trailer featuring this track was narrowly edged out. However, the music was cut and used in the international TV campaign.
Here is the track in its entirety. Hoping that other LOTR fans will enjoy hearing the old musical themes in a new light.
You can visit Blake’s website and read more aobut his work here.