Apple today launched iTunes Radio, the company's first foray into streaming music, as it upgraded iTunes to version 11.1 and its mobile operating system to iOS 7.The Cupertino, Calif. consumer electronics giant unveiled iTunes Radio in June at its annual developers conference, where CEO Tim Cook and other executives highlighted the visual overhaul of iOS 7 and trumpeted a handful of new features, including iTunes Radio.With the delivery of iOS 7 and iTunes 11.1 today, Apple made good on its promises.The free ad-supported service can be played on Macs and Windows PCs through iTunes 11.1, while iPhones, iPads and iPod Touches running iOS 7 access it from the Music App. Customers who fork over $25 annually for iTunes Match -- the service that launched in 2011 which stores trac