Labels not updating, how do I fix it?

I've created a script that will auto update the labels of a GUI. I've tried both Script and LocalScript, yet nothing is working for me. There are no errors whatsoever, which makes me think that the script isn't even running at all.

Here is my code if you need it:

--[[

-- INFO --

Weather

0 = Normal
1 = Rain
2 = Thunderstorm

]]

-- Settings --

local songs = { -- All songs must be 60 seconds or longer (even 59.9999 is not recommended)
    -- Normal
    {Song = script.Day, Weather = 0, TimeOfDay = {"Dawn","Noon"}},
    {Song = script.Sunset, Weather = 0, TimeOfDay = {"Dusk"}},
    {Song = script.Night, Weather = 0, TimeOfDay = {"Night"}},

    -- Rain
    {Song = script.MorningRain, Weather = 1, TimeOfDay = {"Dawn"}},
    {Song = script.Rain, Weather = 1, TimeOfDay = {"Noon","Evening"}},
    {Song = script.NightRain, Weather = 1, TimeOfDay = {"Night"}},

    -- Thunder
    {Song = script.Thunderstorm, Weather = 2, TimeOfDay = {"Dawn","Noon","Dusk","Night"}}
}

























-- Script --



game:GetService("RunService").Heartbeat:Wait()



local RS = game:GetService("RunService")

local dayLabel = script.Parent.Day
local timeOfDayLabel = script.Parent.TimeOfDay

local music = script.Parent.Music

RS.Stepped:connect(function()
    local timeOfDay = "Night"
    local weatherString = ""

    if (game.Lighting.ClockTime > -1) and (game.Lighting.ClockTime < 6) then
        timeOfDay = "Night"
    elseif (game.Lighting.ClockTime < 12) then
        timeOfDay = "Dawn"
    elseif (game.Lighting.ClockTime < 18) then
        timeOfDay = "Noon"
    elseif (game.Lighting.ClockTime < 24) then
        timeOfDay = "Dusk"
    end

    if game.Lighting.Weather.Value == 1 then
        weatherString = " (Rain)"
    elseif game.Lighting.Weather.Value == 2 then
        weatherString = " (Thunder)"
    end

    dayLabel = "Day "..game.Lighting.Day.Value
    timeOfDayLabel = timeOfDay..weatherString

    for _,i in pairs(songs)do
        if (i.Weather == game.Lighting.Weather.Value) then
            local found = false
            for _,v in pairs(i.TimeOfDay)do
                if v == game.Lighting.TimeOfDay.Value then
                    found = true
                    music.SoundId = i.Song.SoundId
                end
            end
            if found == true then break end
        end
    end

    if music.IsPlaying == false then
        music:Play()
    end
end)

Thanks!