How would I go implementing math.random in this script?

The original script is here:

local music = {
	"1839526588",
	"1837871067",
	"4648169560"
}

local music1 = script.Parent.Music
local muted = false

while true do
	for i = 1, #music do
		music1.SoundId = "rbxassetid://"..music[i]
		wait(3)
		music1:Play()
		wait(music1.TimeLength)
	end
end

I have tried to implement math.random into this by doing this:

local music = {
	"1839526588",
	"1837871067",
	"4648169560"
}

local randomMusic = math.random(#music - #music + 1,#music)
local music1 = script.Parent.Music
local muted = false
local ConvertRandomMusicToMusicId = tostring(randomMusic)
local chosenMusic = ConvertRandomMusicToMusicId

while true do
	print(chosenMusic)
	for i = 1, #music do
		music1.SoundId = "rbxassetid://"..chosenMusic[i]
		wait(3)
		music1:Play()
		wait(music1.TimeLength)
	end
end

But it does not seem to work.

Can someone please explain this?