GMusic offers players the ability to change or disable loading screen music for servers that support it.
This in return gets rid of the annoying music that you would have to deal with when loading into a server.
This gives the user the power of choice in if the user wants music when loading into a server that supports GMusic.
Not anymore as with a recent update GMusic now has a Server Dashboard where you can add your own server to GMusic.
All your players have to do is goto the GMusic website which your currently on and add their own songs and it'll transfer between servers that support GMusic.