I'm trying to change an audio that's playing using a module script and a server script.

Module Script Code:

local MusicFuncs = {}

local TweenService = game:GetService("TweenService")

function MusicFuncs:ChangeMusic(Music)
	print("changing music")
	print("music: "..tostring(Music))
	local Music = workspace.Music:GetChildren()
	
	local tweenInfo = TweenInfo.new(
		1,
		Enum.EasingStyle.Linear,
		Enum.EasingDirection.InOut,
		0,
		false,
		0
	)
	
	for i, v in pairs(Music) do
		local tween = TweenService:Create(v, tweenInfo, {Volume = 0})
		tween:Play()
	end
	
	wait(1)
	
	for i, v in pairs(Music) do
		v.Playing = false
		v.TimePosition = 0
	end
	
	Music.Playing = true
	
	local tween = TweenService:Create(Music, tweenInfo, {Volume = 1})
	tween:Play()
end

return MusicFuncs

Server Script Code:

local MusicFuncs = require(workspace.MusicScript)
local Music = workspace.Music.HolographicLandscape
local Ambience = workspace.Music.Ambience

local function Touch(hit)
	print("touch")
	local hum = hit.Parent:FindFirstChild("Humanoid")
	if hum ~= nil then
		print("hum touch")
		if hit.Name == "HumanoidRootPart" then
			print("humrootpart touch")
			MusicFuncs:ChangeMusic(Music)
		end
	end
end

local function Untouch(hit)
	print("untouch")
	local hum = hit.Parent:FindFirstChild("Humanoid")
	if hum ~= nil then
		print("hum untouch")
		if hit.Name == "HumanoidRootPart" then
			print("humrootpart untouch")
			MusicFuncs:ChangeMusic(Ambience)
		end
	end
end

script.Parent.Touched:Connect(Touch)
script.Parent.TouchEnded:Connect(Untouch)

Errors:

Unable to cast value to Object
Stack Begin
Script 'Workspace.MusicScript', Line 33 - function ChangeMusic
Script 'Workspace.MusicRegions.HolographicLandscape.TouchScript', Line 12 - function Touch
Anonymous