Until Spotify hits our shores, your best bet for streaming music online is Grooveshark. The official Grooveshark app was mysteriously removed from the Chrome Web Store, but a user has taken on the civic duty of re-porting it back over. The online jukebox is user-supported: all of the 110 million songs streamed each month are uploaded by Grooveshark's 35 million users. You can pretty much find any song you're looking for. All the features from the website have been ported over, so you can create playlists, stream radio stations, and upload your own songs.