About 25,000 bands each month are signing on with the startup that helps them get music straight to fans. Plus: How indie rocker Sufjan Stevens sold 10,000 albums in one weekend without iTunes, Amazon, or CDs.
Harmonix put music games on steroids when it created Guitar Hero and Rock Band. When the fad ended and parent company Viacom tried to unload it, industry watchers predicted its demise. Now the storied business is bouncing back.