Yesterday, Susan Wojcicki, VP, Product Management, explained this move on Google’s “traditional media blog” :
(…) In 2006, we launched Google Audio Ads and Google Radio Automation to create a new revenue stream for broadcast radio, produce more relevant advertising for listeners and streamline the buying and selling of radio ads. While we’ve devoted substantial resources to developing these products and learned a lot along the way, we haven’t had the impact we hoped for.
So we have decided to exit the broadcast radio business and focus our efforts in online streaming audio. We will phase out the existing Google Audio Ads and AdSense for Audio products and plan to sell the Google Radio Automation business, the software that automates broadcast radio programming. Advertisers will continue to be able to use Google Audio Ads until May 31 and broadcasters will be able to publish inventory to Google until that date as well. We will work with partners to make sure that there is as little disruption to their business as possible and will work to find a buyer for the Google Radio Automation business.