Last.fmiTunes link: Last.fm – Free
This app essentially takes the best bits of the excellent Last.fm site and squeezes them into your iPhone. It allows you to create customised music stations based on a single artist that it then populates with songs from similar artists that it thinks you will like. The track selections are based on previous music you’ve played or tracks that other users with similar tastes have enjoyed.
The app also includes some simple social networking features. For example, you can view the users that have most listened to a selected song and then browse their playlists or see what they’re currently listening to. You can rate tracks as they are played to help the service build up a better idea of your likes and dislikes, which it then uses to improve the playlist it automatically generates for you.
The Last.fm service is superb, but the company has also produced a great app that looks attractive and is easy to use.