Spotify is to extend its "free" ad-supported music service to mobile devices.

Smartphone users will be able to build playlists of songs and then hear them played back in a random order. Tablet users will have more control, letting them select specific tracks.

The Swedish firm also announced it was expanding to a further 20 countries, taking its total reach to 55.

Experts said it needed to make the moves to combat growing competition.

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