TimeLength script not working?

I'm trying to get this to play another song when the first song ends, but I keep getting "ending song" spammed in the output.

repeat wait() until script.Ignore
--Playlist
Songs = {234174567,245311593,175588117,152208064} --there are more songs but too many for sh
--Variables
local Audio = script.Parent.Speakers:GetChildren()
local cont = false
mainspeaker = script.Parent.Speakers.MainSpeaker.Sound

while true do
	local randomize = Songs[math.random(1, #Songs)]
	cont = false
--	script.Ignore.Previous.Value = Audio.MainSpeaker.Sound.SoundId
	for i = 1, #Audio do
		Audio[i].Sound.SoundId = "rbxassetid://"..randomize
	end
	if mainspeaker.SoundId == script.Ignore.Previous.Value then
		repeat wait(.5) mainspeaker.SoundId = "rbxassetid://"..randomize until mainspeaker.SoundId ~= script.Ignore.Previous.Value
	end
	for i = 1, #Audio do
		Audio[i].Sound:Play()
	end
	for i = 1, #Audio do
		for c = 0,1,.1 do
			Audio[i].Sound.Volume = c
		end
	end
	cont = true
	local tim = mainspeaker.TimeLength - 5
	wait(tim)
	print("ending song")
	for i = 1, #Audio do
		for c = 1,0,-.1 do
			Audio[i].Sound.Volume = c
		end
	end
end

There is somewhat of a delay with roblox whenever you change the SoundId of a sound, which causes the time length to not immediately change. Try adding a wait() or wait(.1) before the line where you use the TimeLength property.

If this fails, you'll have to either wait a little more or possibly just resort to using a dictionary (a table that contains each song id as an index with its value as the length in seconds).