Speaking of history, two books cross genre lines to examine social and cultural concepts through music: Ann Powers’ Good Booty: Love and Sex, Black and White, Body and Soul in American Music looks at the ways in which we use music to communicate such fraught issues as race and sex; Superfandom by Zoe Fraade-Blanar and Aaron M. Glazer explores fandom itself — its history, stigma, psychology, and, of course, its effects on our economy.