Digital Trends – After years of anxious anticipation, the hottest music streaming service in Europe, Spotify, has officially launched in the US. Spotify boasts that it will âchange how you enjoy music.â And many in the media have already declared Spotify an [insert competitorâs name here]-killer. I thought Iâd test out that theory. So Iâve put Spotify head-to-head with the two services that most closely resemble the offerings of Spotify (translation: they all have a free option): Pandora and Grooveshark. (Yes, Iâve heard of Rdio, MOG and Rhapsody, too. But weâre leaving those comparisons for another day.) Here, a quick guide to each of these services, and how they stand against one another.