My random picking music script isn't working correctly?

Well, the music plays only once for 100 seconds, then it doesn't choose music again. I don't know if I did something wrong or not, please help me. It also doesn't error when it's looped a full 100 seconds.

music = {176407800, 166886402, 183503743, 185698490, 165065112, 145127587, 155146819, 178066730, 137985283}

while true do
    local id = math.random(1, #music)
    game.Workspace.Sound.SoundId = "rbxassetid://" .. music[id]
	game.Workspace.Sound:Play()
    wait(100)
	game.Workspace.Sound:Stop()
end

Well, you messed up on line 4. You almost had it, though. When getting a random parameter from a table, you have to use the template, which is provided in line 4.

music = {176407800, 166886402, 183503743, 185698490, 165065112, 145127587, 155146819, 178066730, 137985283}

while true do
    local id = music[math.random(1, #music)]
    game.Workspace.Sound.SoundId = "rbxassetid://" .. music[id]
    game.Workspace.Sound:Play()
    wait(100)
    game.Workspace.Sound:Stop()
end

while true do
local h = Instance.new("Hint")
h.Parent = game.Workspace
h.Text = "Game by JustGimmeDaBux. PM JustGimmeDaBux for Information!"
wait(7)
h.Text = "Remember: Griefing, C4, AND flooding are STRICTLY PROHIBITED."
wait(7)
h.Text = "Found an Exploiter? PM JustGimmeDaBux the FULL USERNAME with PROOF!!"
wait(7)
h.Text = "Thanks for playing! Leave a like/comment. Keep building!"

Above is my script. Yours looks like you're trying to do the same thing. Your script below looks fine, but this may work to improve the script.

music = {176407800, 166886402, 183503743, 185698490, 165065112, 145127587, 155146819, 178066730, 137985283}

while true do
    local id = music[math.random(1, #music)] -- Error on this line
    game.Workspace.Sound.SoundId = "rbxassetid://" .. music[id]
    game.Workspace.Sound:Play()
    wait(100) -- You could lower the time because some songs may not have a loop and keep going through blank song until the 100 seconds are up.
    game.Workspace.Sound:Stop()
end -- Before your end, you should add several and then add a repeat script so it randomly repeats the music so your viewers don't run out of music to listen to.

Hope I helped!