iTunes Music Store UK is exclusively offering U2's new single, 'Vertigo', and the track looks likely to be the most downloaded track yet released through the service.

The release - weeks before the song arrives in other formats - has already climbed to the top of the iTunes download charts. The track's taken from the band's forthcoming album, 'How to Dismantle a Nuclear Bomb'.

U2 fan site has a link to a short movie clip of the band performing Vertigo in their Dublin recording studio.

The track has been playing on US radio outlets for three days, and is expected to debut in this week's Billboard Modern Rock Tracks charts Top Twenty. reports a U2 spokesperson, who said: "The track ascended into the iTunes top ten within 24 hours and is on pace to top the list of most downloaded selections".

Single of the week

This week's free iTunes single comes from Hot Chip and is called 'Baby Said'.

Band guitarist and songwriter Joe Goddard said: "I wanted to make an upbeat song with a kind of two-step beat about being lazy and afraid of the outide world - which I am."