Text label does not change text?

Hello! I made a music script where the script takes music from ReplicatedStorage and plays it, it also shows the name of the music on a screen gui but its not working. the text does not change

here is my script:

local MusicFL = game.ReplicatedStorage.Musics
local MusicText = game.StarterGui.MusicGui.MusicFrame.Title

---[Music1] - C418 - Familiar Faces
---[Music2] - C418 - Wet Hands
---[Music3] - C418 - Chirp
---[Music4] - C418 - Wait
---[Music5] - Interstellar - No time for caution

-----------------
wait(3)
MusicFL.Music1:Play()
MusicText.Text = "C418 - Familiar Faces"--- song title change
wait(119)---length of the music
MusicFL.Music1:Pause()-- just to make sure
wait(1)--pause between songs
MusicFL.Music2:Play()
MusicText.Text = "C418 - Wet Hands"
wait(90)
MusicFL.Music2:Pause()
wait(1)
MusicFL.Music3:Play()
MusicText.Text = "C418 - Chirp"
wait(198)
MusicFL.Music3:Pause()
wait(1)
MusicFL.Music4:Play()
MusicText.Text = "C418 - Wait"
wait(238)
MusicFL.Music4:Pause()
wait(1)
MusicFL.Music5:Play()
MusicText.Text = "Interstellar - No time for caution"
wait(248)
print("Test")

also the music does play and it works the only thing that doesn't work is the text changing

First of all, make sure it's a localscript (obviously). Secondly, you're using StarterGui. StarterGui immediately replicates everything to the Player.PlayerGui. So you need to manipulate the PlayerGui, not StarterGui. I'll make the changes + some things you should know. (Don't use pause if you're planning to skip the song at the end). Note: You should use a folder and a for loop to optimise your code.

local musicFolder = game.ReplicatedStorage.Musics:GetChildren() --This sounds complicated, but it returns a table full of values, which is your music.
local textLabel = script.Parent.Title --You should parent your TextLabel to the ScreenGui. You can use this or use this: game.Players.LocalPlayer:WaitForChild("PlayerGui").MusicGui.MusicFrame.Title
for i, v in pairs(musicFolder) --This is a special for loop, which loops through tables. This is good for optimisation.
	textLabel.Text = v.Name --This gives the name of the song. You can use this.
	if v:IsA("Sound") then --This is just to check if it's sound.
		v:Play()
		v.Ended:Wait() --This event will only go through when the sound has ended. This is a better alternative than just looking at the timelength.
	end
	wait(1)
end

A player's GUI and a GUI in StarterGui are different. If your script is local, you can do this:

	local MusicFL = game.ReplicatedStorage.Musics
	local MusicText = game.Players.LocalPlayer.PlayerGui.MusicFrame.Title
	 
	---[Music1] - C418 - Familiar Faces
	---[Music2] - C418 - Wet Hands
	---[Music3] - C418 - Chirp
	---[Music4] - C418 - Wait
	---[Music5] - Interstellar - No time for caution
	 
	-----------------
	wait(3)
	MusicFL.Music1:Play()
	MusicText.Text = "C418 - Familiar Faces"--- song title change
	wait(119)---length of the music
	MusicFL.Music1:Pause()-- just to make sure
	wait(1)--pause between songs
	MusicFL.Music2:Play()
	MusicText.Text = "C418 - Wet Hands"
	wait(90)
	MusicFL.Music2:Pause()
	wait(1)
	MusicFL.Music3:Play()
	MusicText.Text = "C418 - Chirp"
	wait(198)
	MusicFL.Music3:Pause()
	wait(1)
	MusicFL.Music4:Play()
	MusicText.Text = "C418 - Wait"
	wait(238)
	MusicFL.Music4:Pause()
	wait(1)
	MusicFL.Music5:Play()
	MusicText.Text = "Interstellar - No time for caution"
	wait(248)
	print("Test")