Music-player GUI no longer playing music?

A (possibly outdated?) GUI I have used to play music from a playlist. Recently the script hasn't been functioning(as in music does not play) and I'm not quite sure why. Script for the GUI:

local CurrentSong = script:WaitForChild("CurrentSong")
local Playlist = script:WaitForChild("Playlist")
local gui = script.Parent
local MainFrame = script.Parent.SwitchTeam.MainFrame1
local MuteButton = MainFrame:WaitForChild("Mute")
local Songs = {}
for _, child in pairs(Playlist:GetChildren()) do
    table.insert(Songs, child.Value)
end

local songNumber = math.random(1, #Songs)
local nextSong = function()
	if CurrentSong.IsPlaying then
		CurrentSong:Stop()
	end
    songNumber = songNumber + 1
    if songNumber > #Songs then
        songNumber = 1
    end
    CurrentSong.SoundId = Songs[songNumber]
    CurrentSong.TimePosition = 0
    CurrentSong:Play()
end

CurrentSong.Ended:Connect(nextSong)

-- Start music
nextSong()

MuteButton.MouseButton1Down:Connect(function()
    if CurrentSong.Volume ~= 0 then
        CurrentSong.Volume = 0
        MuteButton.Text = "Unmute Music"
    else
        MuteButton.Text = "Mute Music"
        CurrentSong.Volume = 0.5
    end
end)

The mute button does change texts when clicked (obviously I cannot verify if it works anymore because music does not play), however the script WAS functional.

EDIT: Try using NumberValues instead. Inside each NumberValue are the song ids.

And try waiting for the sound to load first before playing it.

local CurrentSong = script:WaitForChild("CurrentSong")
local Playlist = script:WaitForChild("Playlist")
local gui = script.Parent
local MainFrame = script.Parent:WaitForChild("SwitchTeam").MainFrame1
local MuteButton = MainFrame:WaitForChild("Mute")

local SongIds = {}
for _, child in ipairs(Playlist:GetChildren()) do
	if child:IsA("NumberValue") then
		table.insert(Songs, child.Value)
	end
end

local function loadSound(sound: Sound)
	if not sound.IsLoaded then
		sound.Loaded:Wait()
	end
end

local songNumber = math.random(1, #SongIds)
local function nextSong()
	if CurrentSong.IsPlaying then
		CurrentSong:Stop()
	end
	
	songNumber += 1
	if songNumber > #SongIds then
		songNumber = 1
	end
	
	CurrentSong.TimePosition = 0
	CurrentSong.SoundId = "rbxassetid://" .. SongIds[songNumber]
	loadSound(CurrentSound)
	CurrentSong:Play()
end

CurrentSong.Ended:Connect(nextSong)

-- Start music
nextSong()

MuteButton.MouseButton1Down:Connect(function()
    if CurrentSong.Volume ~= 0 then
        CurrentSong.Volume = 0
        MuteButton.Text = "Unmute Music"
    else
        MuteButton.Text = "Mute Music"
        CurrentSong.Volume = 0.5
    end
end)

--

It's probably because of Roblox removing every audio in the Marketplace back in March 2022. This made uploading audios free but the person who uploaded the audio can only be used in their game. You can also give permission to a game to use your audio but it will also need the developer's permission.

What you can do is replace the audios you're using with the public audios (mostly uploaded by Roblox and some music companies) in the Marketplace such as Life in an Elevator (rbxassetid://1841647093) and the classic Raining Tacos (rbxassetid://142376088).