Like when you join the game, the music begins playing and I don't have to be in game saying ':music ___________'
Here's what I would do. Find your music file, check the box that says "Loop" in the Sound's properties. Then, you would start the music by inserting a server script and adding this line of code:
script.Parent:Play()
If you only wanted the music to play once through, then you would leave the "Loop" box unchecked but still leave the script in it.
Hope this helps! :)
I believe you can either manually loop it through properties by selecting the box, or just do the following:
game.Workspace.SoundNameHere:Loop()