Twitter's two-month-old music discovery app has been updated to help you better discover music you actually want to hear. The new feature "charts" helps you discover music from the genre you are interested in getting more music from. This way it's easier to discover music that you have the possibility of liking.
These new charts can be a genre or a specific type of chart such as "Popular." The Popular chart does what you think it would: it compiles a playlist of new music trending on Twitter. The other charts are generated in a similar manner, but are kept to the single genre that the chart is for.
It's not clear how well Twitter Music is doing as Twitter hasn't provided us any numbers. However, with Apple planning to incorporate Twitter Music into iRadio, it could become a lot more popular and valuable to the micro-blogging site.