Spotify the Swedish DRM-based has finally landed in US.

Spotify offers nusic streaming service selected music from a range of major and independent record labels, including Sony, EMI, Warner Music Group, and Universal. [Wikipedia]

Currently, Spotify has more than 10 million registered users, and over 1.6 million paying subscribers they are certain of growth of its membership now that they are in USA.

The company posted from their blog that they were excited to be in the US.
Spotify, the largest and fastest growing music service of its kind, is available from today in the US. We’re massively excited to be here. 
Spotify is a new way to manage your music, discover new tracks and share songs and playlists with your friends. Now you can enjoy music whenever and wherever you like.

An excerpt of Spotify's Wiki entry posted below.
Launched in October 2008 by Swedish startup "Spotify AB", the service had approximately ten million users as of 15 September 2010;[5] about 1,000,000 of which were paying members.[6] The service is, as of July 2011, only available in Finland, France, the Netherlands, Norway, Spain, Sweden, United Kingdom and the United States. 
The system is currently accessible using Microsoft Windows, Mac OS X, Linux, Telia Digital-tv, and mobile devices running iOS (iPod/iPhone/iPad), Android, Windows Mobile, S60 (Symbian), webOS, and Sonos