LocalScript not getting workspace children, fix?

Hello all! I have a PlaybackLoudness script here, it's a more over-worked version, but functions when calling 1 variable in the problem of this script!

So the problem is on Line 5 I am trying to place all of the lights in a folder, in which this script is supposed to run on all of these parts at the same time!

I've used :GetDescendants() and :GetChildren() in which neither of these worked! I am wondering if there is a way to manipulate my code into making it function properly, or, if there is a function I am missing!

LocalScript Location in Stuido : StarterPlayerScripts

Thanks for everyones feedback! Any and all help is appreciated!

local Players = game:GetService("Players")


local LocalPlayer = Players.LocalPlayer
local ColorParts = game.Workspace.Lights:GetChildren() --[[ This is where I believe the problem is, but I could be wrong ]]--

local sound = game.Workspace:WaitForChild("MusicPlayer")

local maxLoudness = 500

while true do
	local amplitude = math.clamp(sound.PlaybackLoudness / maxLoudness, 0, 1)
	if sound.PlaybackLoudness >= 300 then
		ColorParts.BrickColor = BrickColor.Random()
	end
	
	if sound.PlaybackLoudness <= 299 then
		ColorParts.BrickColor = BrickColor.new("Cyan")
	end
		
	if sound.PlaybackLoudness <= 250 then
		ColorParts.BrickColor = BrickColor.new("Lime green")
	end
	
	if sound.PlaybackLoudness <= 225 then
		ColorParts.BrickColor = BrickColor.new("Royal purple")
	end
	
	if sound.PlaybackLoudness <= 200 then
		ColorParts.BrickColor = BrickColor.new("Really blue")
	end
	
	if sound.PlaybackLoudness <= 175 then
		ColorParts.BrickColor = BrickColor.new("Gold")
	end
	
	if sound.PlaybackLoudness <= 150 then
		ColorParts.BrickColor = BrickColor.new("Institutional white")
	end
	
	if sound.PlaybackLoudness <= 125 then
		ColorParts.BrickColor = BrickColor.new("Really red")
	end
	
	if sound.PlaybackLoudness <= 100 then
		ColorParts.BrickColor = BrickColor.new("Dark blue")
	end
	
	if sound.PlaybackLoudness <= 75 then
		ColorParts.BrickColor = BrickColor.new("Neon orange")
	end
	
	if sound.PlaybackLoudness <= 50 then
		ColorParts.BrickColor = BrickColor.new("Burnt Sienna")
	end
	
	if sound.PlaybackLoudness <= 40 then
		ColorParts.BrickColor = BrickColor.new("Institutional white")
	end
	
	if sound.PlaybackLoudness <= 30 then
		ColorParts.BrickColor = BrickColor.new("Pastel Blue")
	end
	
	if sound.PlaybackLoudness <= 20 then
		ColorParts.BrickColor = BrickColor.new("Navy Blue")
	end
	
	if sound.PlaybackLoudness <= 1 then
		ColorParts.BrickColor = BrickColor.new("Black")
	end
	--ColorParts.BrickColor = BrickColor.Random()
	wait(0.05)
end

Hello, BryanFehr!

I'm not sure if this would work but you can probably do something like this.

while true do
	for i,v in pairs(workspace:WaitForChild("Lights"):GetChildren() do
		-- the code inside of the loop here
	end
end

EDIT: I forgot to say something. Change everything in there to v.BrickColor