The differences between tiers - Unlimited is better quality, has an offline mode, and allows full cell phone access. And you need to sign up for an invite to access the free version - which I've done, so we'll see.
Much better choice for a single than "Desire," in my opinion. Released (UK) 13 Jan 2003 - Underwater H2O 022CD 1. David (Radio Edit) 2. David (Darren Emerson's Underwater Remix) 3. Dance You Down (Live from Washington DC)