Finally, the app also gives you full access to songs stored on your iOS device, including playback controls. Needless to say, it also allows you to do the usual "liking" and sharing of songs from within the playback interface.

The challenge with crowdsourced apps is that they depend heavily on having a crowd. When I took Frenzapp Music out for a test spin, only one of my friends was also using the service, making it hard to get a feel for how well the recommendation system works. The potential is there for a pretty useful app--with any luck, the users will be there as well one day.