It's done. Only a couple of days after Spotify, the music streaming website, got the approval for Apple's App Store, it has announced its mobile version. It is downloadable free in both Apple's App Store and the Android Market, but will only be available for their premium subscribers.

Spotify is a popular online music service in the UK offering users music on demand. It is marketed both as a premium monthly subscription service for £9.99 and in a free ad-supported version. Consumers will also have the option to purchase a day pass that gives access to Spotify without advertising.

On the Spotify Blog the reactions have been enthusiastic. Spotify Mobile can stream music over WiFi or 3G and access your Spotify account and search for new tunes. It can also play music without any connection for taking a plane or the underground, if you marked a playlist before.

With features like this Spotify has been seen as a rival to iTunes, because its streaming service provides a huge library of songs for free. Apple's objections might have been a reason to have the mobile version restricted for premium subscribers.

Spotify Mobile is available in the UK, Sweden, Norway, Finland, France and Spain.