It’s probably tricky to time these things to perfection, since Apple pulls the strings.
The UK Spotify competitor, We7, has had its iPhone app approved and is now available to download from the iTunes App Store. The problem is that the associated premium music subscription service, needed to run the app, doesn’t seemed to have launched yet.
Or at least that’s how it looks.
Judging by the site’s subscription page and reviews published in the App Store, whilst you can download the app, since you can’t yet subscribe to the mobile version of We7’s music subscription service, it’s currently useless.