What did I do wrong with this music script? I found it on the internet, and it has always worked.

So I have this script, and I use it for background music in game. The script is a normal script (a-non-local and stuff like that) and the sound that plays the music is called "Music". The sound is in the StarterGui.

local sound1 = 918984470
local sound2 = 949583914
local sound3 = 390846973
music=script.Parent


while true do
    wait()
    music.SoundId="rbxassetid://"..sound1
    music:Play()
    music.Ended:wait()
    wait()
    music.SoundId="rbxassetid://"..sound2
    music:Play()
    music.Ended:wait()
    wait()
    music.SoundId="rbxassetid://"..sound3
    music:Play()
    music.Ended:wait()
    wait()
end

When I look in the output it says "Sound"" failed to load in "StarterGui.Music.SoundId": Request failed"

It works for me with your script or mine. And also works with a local script or server script. Here's a picture of StarterGui- imgur

local sound1 = 918984470
local sound2 = 949583914
local sound3 = 390846973
local music = script.Parent

local function PlaySong(soundId)
    music.SoundId="rbxassetid://"..soundId
    music:Play()
    print("Playing song: " .. soundId)
	
	-- If statement just so I don't have to listen to the whole song
	if soundId == 390846973 then
		music.TimePosition = 30
	else
		music.TimePosition = 250
	end	

    music.Ended:wait()
end

while wait() do
	PlaySong(sound1)
	PlaySong(sound2)
	PlaySong(sound3)
end