Here’s a 4 video soundtrack I made using Abaltat Muse by Tunepresto.com. This awesome software actually makes the music for you, all you do is tell it what musical style to use and select your instruments. I then exported a midi file (I am not a musician) and loaded in GarageBand. There is a simple demo that explains how to do this here
Augustvideo

I wanted to put music to this piece of video that was in keeping with the electronic feel of the pictures. I used Tunepresto’s software because it very quickly gave me the piece of music that I wanted with surprisingly little effort. I had tried other solutions from the music libraries but either they didn’t fit the duration of my vide or the tempo was just not quite what I wanted.
Martin Fox, Videographer, Scotland