If the US launch is anything like the European launch, existing users—including Europeans—will be able to share limited invites with keen Americans. So, y'know, if you know any friendly Europeans, get your bribes in now.
This slow invite-only approach will help Spotify retain its exclusive reputation, whilst also ensuring their servers aren't too hammered by the attention. If reports are correct, it could be launching as early as this week. [via Mashable]