Why doesn't my song play?

I'm trying to make a song play when a player enters a game, but, when I test it, it just starts for 2 seconds and gets muted. Script I use:

function onPlayerEntered(newPlr)
game.Soundscape.HaloTheme:Play()
local unloop = game.Soundscape.HaloTheme
unloop.Loop = false
end

game.Players.PlayerAdded:connect(onPlayerEntered)

Does anyone have a idea to solve that problem?