Music fading script does not want to work?

Hi, i am making a game wich has different sounds. I want the music to fade whenever it starts or ends, i tried putting a localscript inside the sounds with a played and ended function, however when the song ends it does not work. Could anyone show me a good way to script this?

Old script that did not work (Only works when it starts the sound):

script.Parent.Played:Connect(function()
	local targetvolume = 0.5
	script.Parent.Volume = 0
	while wait() do
		if script.Parent.Volume <= targetvolume - 0.01 then
			script.Parent.Volume = script.Parent.Volume + 0.01
		else
			if script.Parent.Volume == targetvolume then
				break
			end
		end
	end
end)

script.Parent.Ended:Connect(function()
	local targetvolume = 0
	if script.Parent.Playing == true then
		while wait() do
			if script.Parent.Volume >= targetvolume + 0.01 then
				script.Parent.Volume = script.Parent.Volume - 0.01
			else
				if script.Parent.Volume == targetvolume then
					break
				end
			end
		end
	end
end)