"Dream within a Dream" (Hans Zimmer) features a thrilling introduction. 0:00-0:02 introduces a basic rhythmic beat that crescendos and expands in register to higher pitches. At 0:03, the rhythm adds more beats, and the melody contains unresolved harmony (every other 4 measures has a non-tonic chord for suspense). Finally, from 0:27-0:34, an ominous foghorn-like melody penetrates the air (with a deep timbre and crescendoing volume to stand out). All these effects build suspense and create a tension that is added to when the main melody arrives at 0:46.