A new NPR app for iPhone users launched last night. “[W]ith the NPR Music app for the iPhone, we have another crucial new vehicle for sharing music with our audience,” writes Anya Grundmann, e.p. of the multi-genre music website, on the Inside NPR blog. The app’s launch coincides with release of Apple’s newest iPhone, but the software also works on 3GS iPhones and the iPod Touch. It has multitasking capabilities that allow users to listen to audio while doing other things with their iPhones. A New York Times feature on the growing popularity of NPR Music, pegged to the app release, reports that traffic to the website hit 1.7 million unique users in May.