Ruby

“Adam relented. As they kept walking and the Orphan Girl kept piping her song and the fish kept darting through the air around them, he threw out intention of his own.
The volume of the resulting boom surprised even him; he heard it in one ear and felt it in both feet. The others all startled as another bass-heavy boom sounded at the beginning of the next measure of the tune. By the time the third thud came, it was obviously pounding in time with the music. Each of the trees they passed sounded with a processed thud, until the sound around them was the pulsing electronic beat that invariably played in Ronan’s car or headphones.
“Oh God,” Gansey said, but he was laughing. “Do we have to endure that here, too? Ronan! ”
“It wasn’t me,” Ronan said. He looked to Blue, who shrugged. He caught Adam’s eye. When Adam’s mouth quirked, Ronan’s expression stilled for a moment before turning to the loose smile he ordinarily reserved for Matthew’s silliness. Adam felt a surge of both accomplishment and nerves. He skated an edge here. Making Ronan Lynch smile felt as charged as making a bargain with Cabeswater. These weren’t forces to play with.”
― Maggie Stiefvater, The Raven King