Can't play Tween & Sound in Function

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#1

I’m trying to make a Lobby music play each time he returns to the main menu, the music should slowly increase volume to 1 trough tween, but it isn’t working somehow I can’t play the sound in the function I’m using

local LMT  = TweenService:Create(LobbyMusic, TweenInfo.new(10), {Volume = 1})
local function MenuON()
	MainMenu.Enabled = true
	LMT:Play()
	LobbyMusic:Play()
	LMT.Completed:Wait()
end