ROK Mobile is the first service to use a new Gracenote product, the Rhythm API, which allows for highly personalized streaming radio and powers the Mood Grid, a feature that allows the listener to fine-tune a station based on mood. […] ROK Mobile is a mobile virtual network operator, or MVNO, a mobile service that doesn’t own the wireless infrastructure that provides services to its customers. ROK Mobile will launch on the Sprint and T-Mobile networks. – Glenn Peoples, Billboard http://ift.tt/1nLMLeU