Finalising trailer and adding music

We've now finally completed editing the visual aspects of our trailer using imovie. It runs at about 1 minute which is typically long for a teaser trailer but within the boundaries of teaser trailer conventions. The final step to complete our project is to add music.
We have been searching the copyright free music sites and have found three sites we considered to have some effective soundtrack music.
They were:
http://www.soundjay.com/free-music.html
http://derekaudette.ottawaarts.com/music.php
http://www.jamendo.com/en/albums

After searching through some of the music on these sites, we decided on a combination of two pieces of music to incorporate in our trailer. The first is called 'Cautious path' and is taken from the first website written above. This is quite a slow, eerie and mysterious beat we think will establish the desired tone and mood of the trailer.
The second piece is the instrumental introduction from a song called 'Behind you' by an artist called Magdalen Graal, which was found on the third website written above. This is a much more upbeat tempo which we would like to use in the later part of the trailer as from my research I found is common in trailers to crescendo and heighten the drama. The faster tempo will also add a sense of speed to the chase featured in our trailer. We will be working now to add the pieces of music so they fit smoothly and effectively to finish off the trailer and add power and impact to support the visual aspects. We may also use a sound effect, most likely a heartbeat.

We have now also decided on the tile of 'Missing' for our film. We chose this as a one word title, similarly to 'Taken' which was the primary film for my research, is bold, powerful and can often have the most impact. The word is also very direct and relevant to the primary theme of our trailer/film.