Simple music script?

I'm making a start up menu for a game, it's supposed to play music when you see it. Except it won't play.

This is in a local script. This script is in StarterGUI

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game.Players.PlayerAdded:connect(function()
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    script.StartMusic:Play()
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end)

One player game by the way.

Any ideas why it's not working?

If it's only a one player game, you don't need to do the game.Players.PlayerAdded function. Simply play the music with

script.StartMusic:Play()

Otherwise, make sure the volume is at 1 and the pitch at 1, make sure the soundId is valid. (Should look like:)

"rbxassetid://0000000" -- 0's being the ID, you make sure this is what it looks like in properties.