The Music of the Pearl

I think that the pearl itself is just an object, and it's the people that make it evil. The music just represents what Kino feels at the moment that it appears. In Kino's family, I think that the pearl made them a little more greedy and they wanted more, more, more. The same effect happens to the other villagers, someone even attacked them at night trying to get to the great pearl, most likely wanting the great wealth that it possesses.