Simple Script, why isn't it working?

This is a REALLY simple script but it is not working, help?

msc = script.Parent.Music

function onEntered()
msc:Play()
msc.Volume = 0.1
wait(0.1)
msc.Volume = 0.2
wait(0.1)
msc.Volume = 0.3
wait(0.1)
msc.Volume = 0.4
wait(0.1)
msc.Volume = 0.5
wait(0.1)
msc.Volume = 0.6
wait(0.1)
msc.Volume = 0.7
wait(0.1)
msc.Volume = 0.8
wait(0.1)
msc.Volume = 0.9
wait(0.1)
msc.Volume = 1
end

game.Players.PlayerAdded:connect(onEntered)

Make sure your sound isn't in the ServerScriptService

If you're trying to make it play on the entire server, I advise putting the sound in the Workspace.

msc = game.Workspace.Music

function onEntered()
wait()--This will wait for the sound.