click on image to enlarge (via TechCrunch)

iPhone music apps are hotter than hot. Not just because of the big numbers they can deliver, but also because iPhone users are early adopters that help spread the word. But a new Ad Mob survey should remind music marketers not to forget Google Android users when planning their development schedule.

According to the study, U.S. Android traffic increased to 46% of overall smartphone OS web traffic compared to 39% for the iPhone operating system. Worldwide, iPhone held the top spot with 46% vs. 25% for Android. AdMob measures mobile ad impressions, which they use as a measure of overall traffic.