What is wrong with this music play script?

I had my friend check out my games and he said it is playing two songs at the same time. Is there a problem with this script:

--Made by Stickmasterluke
gw=game.Workspace

function message(text,time)
	local oldmsg=gw:FindFirstChild("Hint")
	if oldmsg then
		oldmsg.Parent=nil
	end
	local spacenumber=time*25
	local msg=Instance.new("Hint")
	msg.Parent=gw
	--[[for i=1, spacenumber do
		wait(1/25)
		local maketext=""
		for i2=1, i do
			maketext=maketext.." "
		end
		maketext=maketext..text
		for i2=1, spacenumber-i do
			maketext=maketext.." "
		end
		msg.Text=maketext
	end]]
	msg.Text=text
	wait(4)
	msg.Parent=nil
end

last=""
lastlast=""
while true do
	wait(.1)
	local tracks=script:GetChildren()
	local rn=math.random(1,#tracks)
	local track=tracks[rn]
	if track~=nil then
		if track.className=="Sound" and track.Name~=last and track.Name~=lastlast then
			lastlast=last
			last=track.Name
			message(track.Name,5)
			track:play()
			wait(120)
			track:pause()
		end
	end
end