Although the content you see on the main page is aimed toward Chinese users, showing mainly music hits from that country, you can search for and listen to any music artist in the world. Plus, most of the interface is actually in English, so you won't have any trouble using it. In any case, the app isn't difficult to use at all: you click on an album to see the songs in it, and click on a song to listen to it.
Aside from listening to thousands of songs for free, JOOX Music also provides access to thousands of music videos. You just have to click the video icon when you find it available for a song.
As usual in this type of application, JOOX Music lets you create your own playlists, save your favorite songs, etc. It incorporates every important feature a music streaming application should have.
JOOX Music is a pretty good music app that offers one month for free (after registering via Facebook). Its great advantage is that it offers songs that are not available on any other platforms.
Requires Android 2.3.3 or higher