Xivio is a great site.
FREE to play, NO downloads!
Members can explore many rooms in Xivio World, main rooms, other members rooms, and their OWN room. (complete with a lock and a lease.)
There are MANY items that members can use to customize their avatar "Xiv", and their room. Their hompy (personal homepage) can also be customized with their own background, images, and colors.
They upload their own music, their own videos, and keep their own personal blog updated.
They can listen to music in their own room that they create, and let their in world friends listen and visit. Members customize their avatar, and their own room. New items are added often.
The site has ALOT of features, so when you join take your time, and ask questions.
Free members and premium (paid) members have the same chances at getting rares and other items. All members are treated the same.