Let's start off this section with my favorite instrumental "build up" either from a song or a movie be it for suspense or for another effect.
1. Code Red composed by Elliot Goldenthal from Final Fantasy - The Spirit Within. Damn this song builds up from a whisper to a thunderous overture. It is from the scene where Dr. Aki is operating on Cpt. Edwards to remove a phantom contamination.
2. Timecrash - The Fifth Element Soundtrack. Only my favorite movie!
3. Jean Michel Jarre - Oxygene Part II. Builds from a simple synth lead into an intricate and technical piece with consistant beat all the way through.
4. Bolero - This piece runs through a number of soft instruments and builds each cycle adding more instruments.
5. The Rise of Sodom and Gomorrah - Therion. The first 1min 10sec. Similar to Bolero in method starting with a single instrument and adding layers.