Playing Music in Certain Areas not Working?

script.Parent.Touched:connect(function(hit)
    local hum = hit.Parent:FindFirstChild("Humanoid")
    if hum then
        local char = hum.Parent
        local plr = game.Players:GetPlayerFromCharacter(char)
        if plr then
            local gui = plr:FindFirstChild("PlayerGui")
            local music = gui:FindFirstChild("Music") --variable
            local forestmusic = music:FindFirstChild("ForestMusic") --error
            local townmusic = music:FindFirstChild("TownMusic")
            forestmusic.Volume = 0
            townmusic.Volume = 1
        end
    end
end)

My script works in studio but not in a game. The error is saying that the "music" variable does not exist but it is clearly defined in the script. I don't understand what is wrong.