Grooveshark is a online radio and audio streaming website. Their main interface is for searching music on their database. It allows users to search for their favorite music and even upload it to share with others. They have a social media component as well. The Grooveshark recommendation feature allows users to find similar songs in their playlist and then queues them later playback. And of course, users can then rate the songs. Grooveshark claims that they stream about 200-250 million songs per month with more than 27 million members. As for whether it is legal or not, well, only the authorities can tell us.

Grooveshark