Taj Mahal is credited with helping popularize American blues over the course of his five-decade career. Jay Blakesberg/Courtesy of the artist hide caption

itoggle caption Jay Blakesberg/Courtesy of the artist

The Ouya game console and controller. Games are sold through something like an app store, allowing customers to sample them before buying. Courtesy of Ouya hide caption

itoggle caption Courtesy of Ouya

Blake Morgan's songs were played some 28,000 times over a 90-day period on Pandora, earning $1.62 in royalties. Jim Herrington/Courtesy of the artist hide caption

itoggle caption Jim Herrington/Courtesy of the artist