Rdio has been busy upgrading its music quality in recent months, with the results unveiled yesterday. “We’re happy to announce we’ve converted our entire catalog of over 30 million songs to high-quality AAC audio,” the company announced. That means its users now have four choices for sound quality, starting at 64kbps for those streaming over a mobile data connection who are conscious of not banging up against their tariff limits, to 320 kbps for the company’s premium users. The 64kbps mode compares to the previous 96kbps default – so a reduction of a third in data consumption. “The biggest things customers have been asking for over the years have been higher quality audio and … better use of data,” CEO Anthony Bay told VentureBeat. “By moving to AAC at lower bitrates we’re able to deliver a higher quality audio experience using less data.” The news came as Rdio released an update to its iOS app, with support for Apple’s CarPlay system for controlling the app in-car.