Spool is an online music player which allows you to make playlists and share music with friends. You can listen to music of your friends in realtime. You can select diffrent songs of the Spool library and add it to your own playlist via drag and drop. To save your created playlists you have to create an account and login.� If you want to know more about spool and you would know how it works, look at this video. If you don’t like to watch the movie you can read more in Spool’s FAQ.
I think it’s a very good service because I can listen to my music on each computer with internet access and speakers. That’s nice for office work.