What is the theme in A Visit from the Goon Squad by Jennifer Egan?

The music business is one of the main themes in Jennifer Egan's "A Visit from the Goon Squad. Bennie is the first person to show real interest in the music business. While many high school kids are in bands and are absorbed by the music scene, Bennie Salazar seems to be interested in everything from the music itself to how it is recorded, produced and promoted. This interest leads Bennie into a life long career in the music business with all of its changes, ups and downs. Bennie eventually opens his own record label, Sow's Ear Records, in New York. Bennie's first big break comes with a band he signs. The Conduits go multi-platinum and Bennie's career takes off.