IIS has gMusic 2 (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly $1.99) for a limited time.

Google Music allows you to keep up to 20,000 of your favorite songs in the cloud. Now you can listen to your entire music collection without having to use any space on your iOS device. gMusic 2 is optimized for iOS 7 and Google Play All Access.