Ist das richtig (vorallem type=)?
<object id="mucke">
<param name="autostart" value="true">
<param name="hidden" value="true">
<param name="type" value="audio/mpeg">
<param name="src" value="orgel.mp3">
<embed src="orgel.mp3" type="audio/mpeg" loop="true" autostart="true" hidden="true">
</object>