Grooveshark

Grooveshark is an online music streaming service based in the United States. It has a search engine, streaming service, and recommendation application. Users can stream and upload music that can be played immediately or added to a playlist.

As of January 2012, Grooveshark has been sued for copyright-violations by all the major music companies. For one suit complaining about copyright-infringement, the liabilities have been estimated at seventeen billion U.S. dollars. Concerns about copyrights led Google, Apple and Facebook to remove Grooveshark's applications from Google Play, the App Store (iOS) and Facebook platform respectively.

Free accounts
Usage for Free accounts is not time-limited like so many other places. Grooveshark uses display ads that can be easily blocked with AdBlockPlus. Like Last.fm it will display a notification if it doesn't detect activity on the page and pause the music.

External tools
With the desktop application Groovewalrus (free Windows/Linux) it also possible to play unrestricted music from Grooveshark with the option to download the tracks as well.