Snakes cannot hear. They have no hearing structures. They can feel vibrations however. Your stereo volume may cause the cage to vibrate (which may elicit a feed response if you stick your hand in the cage) but chances are the snake will be accustomed to the vibrations if it is a continual thing (especially since it excludes a heat source that they can "read"

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Interesting Fact: A persistant legend is that cobra charmers "charm" thier snakes with music. The truth is that snakes can't hear at all, they are attracted to the movement of the instrument. They keep it in focus and move to its movement as if defending against any predator. In fact, it will follow the movement but will not strike because it cannot. Cobras used to roadside shows are force fed and thier fangs are broken off with a stick before a show. Sometimes charmers sew up the lips.
Kim
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