Huey Lewis and the News are celebrating their 30th anniversary with their “Still Workin’ for Living’’ tour. The iconic Marin County band arrived on the national music scene as MTV began to change the industry. Now I-Tunes and other new technology have reinvented the business model yet again and transformed the way music is made and consumed. What defines success for an artist today? Does music play a different role in popular culture than it once did? Huey Lewis shares his unique perspective.