Orchestration
Probably the most distinctive feature of the first A section is its orchestration. It opens with a solo that combines synthesized and real sounds of the celeste, a keyboard instrument whose keys strike metal bars that sound like small bells. Because the celeste is not exactly an everyday instrument, it has something of an ethereal sound, all the more so in Hedwig’s Theme since the sound is electronically manipulated and therefore literally unreal. But at the same time, the celeste is associated with the imaginative world of children primarily through the “Dance of the Sugar Plum Fairy” from Tchaikovsky’s ballet, The Nutcracker, whose fanciful creatures are presented through a young girl’s dream.
Harmony
Harmonically, Hedwig’s Theme is essentially in the key of E minor, but the chord progressions are anything but typical for a minor key. As shown in the example below, the first two bars of the theme outline the E minor chord, and the bass extends the E into bar 5, all of which clearly establishes the key. But in bar 6, we get a very strange chord:
01-Hedwig---harmony-to-A
Taken together, the notes of bar 6 are B-D#-F-A#, which is similar to E minor’s dominant seventh chord, B-D#-F#-A. Had Williams given us the actual dominant seventh, the music would have been within the realm of the ordinary. But by substituting F# with F, and A with A#, he instead creates a chord that cannot be fully explained, much like the workings of a wizard’s magic.
As shown in the example below, bars 9 and 10 of the theme return to the original E minor chord along with the same opening melody. But in bars 11-12, the music suddenly heads in a new direction, sounding out three more minor chords that bear no relation to one another. The resulting sound isn’t just unusual. Since the progression is inexplicable, it creates an aura of wonder as well, a perfect musical accompaniment for a world of magic and mystery. Indeed, Williams even writes “Mysterioso” at the start of the score.
02-Hedwig---cadence-chords-to-B
Williams has used a series of minor chords before to accompany similarly mysterious circumstances: the opening scene of E.T., when the aliens are collecting samples of the Earth’s plant life and we are unsure at this point whether or not these aliens are friendly, and in Raiders of the Lost Ark as the theme for the Ark itself, whose divine source of power is shrouded in mystery. Hear these two passages below (from the start of each clip). (This information is straight from filmnotes.com this information and writing does not belong to me)
