GUI skip button won't play any music. Why?

I made GUI button that has two skip buttons. When you press forward skip, it plays a song playlist. Inside clickbutton, I added audio which inside of it, I added a script:

	math.randomseed(tick())
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math.random() -- throw out first not-very-random value (known limitation of lua)
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musicTable = --Making a table of music / your songs
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{
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    "rbxassetid://142305080",  -- 1 - Let's Groove
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    "rbxassetid://671389213",  -- 2 - Can't Touch This
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    "rbxassetid://609246843",  -- 3 - Take on Me
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    "rbxassetid://1100823134", -- 4 - At Dawn
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    "rbxassetid://681266896",  -- 5 - Safety Dance
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    "rbxassetid://323743169",  -- 6 - Working for the Weekend
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    "rbxassetid://442656036",  -- 7 - Don't you (Forget About Me)
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    "rbxassetid://706699539",  -- 8 - Beat it
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    "rbxassetid://838691861"   -- 9 - Hey you, you better keep walking!
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}
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script.Parent.Parent.MouseButton1Click:Connect(function()
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    while true do
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        local index = math.random(1, #musicTable - 1)
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        musicTable[1], musicTable[index] = musicTable[index], musicTable[1]
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        for i = 2, #musicTable-1 do
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            index = math.random(i, #musicTable)
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            musicTable[i], musicTable[index] = musicTable[index], musicTable[i]
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        end
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        for i = 1, #musicTable do
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            wait(1)
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            script.Parent.SoundId = musicTable[i]
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            script.Parent:Play()
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            script.Parent.Ended:wait()
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        end
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    end
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end)

For some reason, it doesn't work at all. Why?

You'll probably need a main loop to play songs and a function to skip the current song (untested code):

local music = {
	142305080;
	671389213;
	609246843;
	1100823134;
	681266896;
	323743169;
	442656036;
	706699539;
	838691861;
};
local song = 0;
local last;
local sound = script.Parent;
local button = script.Parent.Parent;

button.InputBegan:connect(function(input)
	if(input.UserInputType == Enum.UserInputType.MouseButton1)then
		sound:Stop();
		-- stop the sound, therefore forcing *Ended* event and main loop to reset
	end
end)

while(true)do
	last = song;
	repeat
		song = math.Random(1, #music);
	until(song ~= last)
	sound.SoundId = "rbxassetid://" .. music[song];
	-- easier to add songs
	sound.Loaded:connect(sound:Play());
	-- make sure song is loaded
	sound.Ended:Wait();
	-- called when sound:Stop() is called or sound reaches end
end