The script:
game.Workspace.Meltdown.Music6.Played:Connect(function(SoundId) script.Parent.Parent.StarterGui.ScreenGui.Enabled = true script.Parent.Parent.StarterGui.ScreenGui.TextLabel.LocalScript.Disabled = false end)
If the script is a localscript then this should fix it:
game.Workspace.Meltdown.Music6.Played:Connect(function(SoundId) game.Players.LocalPlayer.PlayerGui.ScreenGui.Enabled = true game.Players.LocalPlayer.PlayerGui.ScreenGui.TextLabel.LocalScript.Disabled = false end)
The startergui replicates gui's into your playergui, so if you want to change any guis you have on the players screen(doesnt matter if its unvisible or stuff) you have to check in playergui.