Half a month ago, Ye Qingxuan had come out of the library and slept for two days straight afterwards. When he had woke up, he told Abraham and the others something totally shocking, he seemed to have found a music sheet entirely suitable for him.
But before Abraham could be happy for his student, bad news came. "Black Friday" was so unconventional that it barely stayed in line. It was a hair’s width away from being demonic music.
The relationship between its notes created an "interval." Usually, music pieces avoided using the "tritone" interval and instead used "pure tones." The disharmony of a tritone interval could activate the dark side of man’s heart and of the aether, causing people to turn wild. Yet Black Friday almost entirely used those demonic intervals. Even the dark pieces that Satan had given to his own squire were not so hopeless, frantic, or eerie as "Black Friday."