Several years back, Kazaa shed its roots as a file-sharing service with questionable content and is now a legitimate music subscription service. To expand its offerings, the subscription service recently introduced both an iPhone and an iPad client.
Similar to Rdio and Spotify, Kazaa lets you listen to music on the fly on your iOS device. The app lets you search for artists, create playlists and sync your music for offline listening. Kazaa for iOS is available for free, while the service has a $10 monthly fee.