A few other notes from the spectrum: the final chord is D major, with little F#. Between 14 and 19 seconds, the pitches take 5 jumps to their destination, at about .9 seconds per jump. (This is the part that sounds like rising tones before the final chord.) The jumps aren't synchronized, or else there would be a 67bpm rhythm to this part. The jumps aren't smooth, but an exponential decay, where they move rapidly at first, and then slow down. In the first part, the frequencies wander between about 130 and 260 Hz, with a noticeable peek at exactly 200 Hz. (And of course the harmonics.)

This will make more sense if you see the spectrum; I've put a picture of the spectrum at: https://picasaweb.google.com/lh/photo/qbuyIVSC2Bsvgxg5HlSD4-... Time is the X axis, and frequency is the Y axis. The lines that move in parallel are harmonic frequencies.