After nearly a dozen years working through royalty-fee negotiations, forging partnerships with hardware companies and perfecting its technology, Pandora Media Inc. (NYSE: P) has become a household name synonymous with personalized radio. "We've hit many rough spots," says Founder and Chief Strategy Officer Tim Westergren, 45, who maxed out credit cards and fought off skeptics along the way. "But we had an unshakable belief that we could make it work. Pandora is transforming the last medium yet to be disrupted by the Internet."