The music streaming wars have officially begun. Google on Wednesday announced Google Play Music All Access, a streaming music service for smartphones, tablets and desktops. All Access, which launches in the U.S. on Wednesday, allows users to stream "millions" of songs, create personalized radio stations and discover music based on their music preferences, according to the company. "This is radio without rules," Chris Yerga, Android's engineering director, said when he introduced the service at Google's annual I/O conference in San Francisco. "It's as lean back as you want to as or as interactive as you want it to be." The service, which will be available for $9.99 per month after a monthlong free trial, competes directly with Spotify, the 5-year-old streaming music service that launched in the U.S. in 2011, as well as Pandora, the Internet radio giant. Unlike All Access, which has a monthly fee, Spotify uses a "freemium" model; ...