Read all of Slate’s stories about the 25 Greatest Picture Books of the Past 25 Years. On Oct. 8, 2010, the New York Times ran a story on its front page: “Picture Books No Longer a Staple for Children.

By the time the five members of Tomorrow X Together (TXT for short) appear, not from the stage but through the pit doors, weaving past the barricades and into the sea of fans, the noise has swelled to ...