Parts a and b put together sounded like a cat with chalkboard, and the cat has adamantite claws... at 2:10 together... my ears ;_;
That is, at the exact same time...
I do that instead of both instantly, and it sounds like a song that should exist.
I tried that by playing two windows with a youtube extension of this song together. One at 2:47, the other one at cca 0:08. It sounds interesting, but it breaks apart after some time.