iTunes radio has continued to brag about its performance since its launch. In slightly overlooked news, Tim Cook said that Apple’s streaming service has over 20 million listeners, who have listened to over 1 billion songs thus far. Though the service is only available in the U.S., the numbers are indicative of the fact that listeners want to be able to access their music across multiple platforms, digitally, wherever and whenever they want. Between the success of Spotify, iTunes Radio, and Rdio, among others like GrooveShark, it’s clear that music listeners prefer this type of listening experience.