Yes, that is how I discovered Susumu Hirasawa's music, it really adds a mood of its own to Kon's work. I think I haven't seen Perfect Blue out of Kon's filmography, and I'm curious to see how Dreaming Machine will turn out, released posthumously and all.
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Gonechoo
Satoshi Kon's work was wonderful. Added bonus for the fact he used Susumu Hirasawa's music in most of his projects.