print("SystemA Started")
Id = script.Parent.EveryThing.System.Id.NumberValue

Pitch = script.Parent.EveryThing.System.Pitch.NumberValue

Volume = script.Parent.EveryThing.System.Volume.NumberValue

local Sound = Instance.new("Sound") --You had a random do above this line, so that has been removed, along with the extra end.

Sound.Parent = script.Parent

Sound.Looped = false

Sound.SoundId = "http://www.roblox.com/asset/?id=266005094"..Id.Value..""

Sound.Pitch = Pitch.Value

Sound.Volume = Volume.Value
while wait() do --Changed to "while wait() do" as it reduces the extra line.
Sound.SoundId = "http://www.roblox.com/asset/?id=266005094"..Id.Value..""
Sound.Pitch = Pitch.Value
Sound.Volume = Volume.Value
Sound:Stop() --Stops first so that you don't get the same sound playing multiple times.
if script.Play.Value == true then
script.Play.Value = false
wait(1) --A delay to let the SoundId, Pitch and Volume change.
Sound:Play()
end
repeat wait() until script.Play.Value == true --Waits until the play value is true again so that it doesn't stop and replay the song in a loop, causing it to not play at all.
end