[bladeofdarkness]

i don't know if this has been mentioned before
in ep 5, the moment that kanade mentions what her name is, the music picks up like its trying to tell us something.
its hard to describe, but for some reason, it FEELS the same way as the color wash in haruhi and Clannad.

as if until the moment the lead met the girl, the world was a place of monochrome, and only once meeting her does the world start looking colorful.
except that it tenshi's case, its not the color thats returns, its the music.

which fits fairly well with her overall music theme
her name means playing music, her powers are named after sound effects (sonic, distortion, harmonics), and the intro has her playing a piano through out.
so it makes sense that the first real time otonashi (soundless) talks to her, the music comes back.