Do you know MusicPlayOn? (comments welcome). MusicPlayOn is a worldwide music sharing platform, which is available in over 20 languages. Furthermore the service provides mobile apps at all well known app stores both for iPhones and Android.
MusicPlayOn provides music of a broad array of genres. Furthermore the site is offering an upload feature, which makes it a music promotion tool. Furthermore there are features like Karaoke and Playlists.
Opposed to these many features the site looks a bit old style, but that might be caused by my own habits: The ads are not well arranged and registration only works directly and not via social login.
To check the usefulness I did a little test using the statistic tool Easy Counter. The tool suggests a global ranking of about 7000, which is a good result. In April the site had a reach of about 150000 visitors per day, which has gone done to about 33000 visitors per day in summer.
The conclusion is that MusicPlayOn is a music sharing site with a reasonable reach and many options. But look for yourself, if it is useful to you: MusicPlayOn.