My initial gut instinct was that this book had a rock soundtrack, but it was more than that. It clearly had one spanning decades of rock, from AC/DC to Gojira.
While he slept, author Mark Tyler Watts accidentally unleashed a creature from his stories into the world. The cannibalistic Atahsaia attacked and horrifically killed two women in town. By the time Watts realized it was from his own writings, more creatures had been let loose, all seeking flesh and chaos.