In Tokyo Ghoul: Root A episode 1, there's a song between 0:00-1:07. I know it may be a unique thing just for that scene but if there's a full song, I'd love to know.
That song is from Tokyo Ghoul Root A OST Disk 2 and it is called AMON.
You can hear it here.
PS: You can identify the song better if you jump to 1:50.
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