Pitch script

s = Instance.new("Sound",game.Players.haloguy51.Character.Head)
s.SoundId = "rbxassetid://238770234"
s.Looped = true
s.Pitch = 1
s:Play()
while true do
for i = 1,20 do
s.Pitch = s.Pitch - 0.02
wait()
end
for i = 1,20 do
s.Pitch = s.Pitch + 0.02
wait()
end
end