iTunes Radio is embedded in the iOS Music app, which contains non-streaming functions.
Those results are pretty well in line from other comScore findings from the second half of this year, which have consistently shown Pandora as a juggernaut in the mobile field. In its August mobile report, comScore ranked Pandora as the No. 5 most popular app with 69 million monthly users. iTunes Radio/iCloud was the closest music-only service with 40.5 million monthly users. ComScore also ranked mobile programs by time spent in-app in November. Pandora topped that list with an average of 1,271 minutes per visitor.