Swedish music streaming service Spotify lets users create playlists of songs for free, although tracks are peppered with adverts just like commercial radio.
However, for 99p, Spotify users can purchase a whole day of ad-free listening time, or alternatively pay a £10 monthly subscription and never hear an advert again.
The service also allows users to create 'collaborative' playlists, which are assigned their own web addresses, and can then be added to by other Spotify listeners.
The Spotify application, which was by at the end of last month, is available free from the iTunes app store, can only be downloaded by those Premium users that pay a monthly subscription.
The app lets users search and stream Spotify's catalogue of millions of tracks and any changes made to playlists from the phone will be instantly synched with your PC's desktop application and vice versa. If playlists have been downloaded, they can also be played when there is no web connection.