Yes, you have to bind keys in a form: "bind key blahblah" without any brackets. (Those were meant just for clarity.)
And sorry, but I don't have a clue why mp3 file isn't loading. Commands "mp3 play blahblah" and "mp3 stop blahblah" used in the script should work. (At least in last Steam version of Half-Life it works fine.) ... Does it write you any error in a console when you turn the script on and off?
Vankulas
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