I've been trying for an hour and I can't get my code to make the autostart shut off. I may just be slightly retarded or something but please help! This is the code I've been using.

<embed name="ProductionDemo"
src="Production Demo Mixdown (3).mp3"
width="300"
height="90"
autostart="FALSE" />

Should work. Try changing the filename, take out spaces and parens.

<embed height="50px" width="100px" src="song.mp3" autostart="false"></embed>

This is a good reference to the 3 main methods of embedding sound. Embed - Object - Audio
http://www.w3schools.com/html/html_sounds.asp