Reuters: IHeartRadio, the digital music service for a network of traditional radio stations, announced it had more than 80 million registered users in the intensifying fight to court listeners online. IHeartRadio, whose parent company iHeartMedia was formerly known as Clear Channel, allows users to access radio stations across the United States, create custom stations and listen to podcasts. “Their ability to live in the physical world and the digital world at the same time is pretty unique.”