The Pandora-like custom music service of Clear Channel's iHeartRadio will stay ad-free at least until spring.
Inside Radio reports that listeners are hearing promos calling the service "commercial-free until April."
Clear Channel "has enticed more than 18 million users to register for the service by making that a requirement to use the custom feature. Collecting ZIP code, gender and age data from registered users will enable iHeart to serve more targeted advertising," wrote Inside Radio.
"If it was easy to stick ads in between songs on a CD, labels would have done it long ago," president of digital Brian Lakamp commented. "We'll make an announcement when we've struck the right balance between the consumer expectation and the advertising opportunity."