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My son had an interest in music from an early age, but never studied it in any way until 5th grade band. (I did play classical music at home from time to time, and his dad occasionally played the guitar. That was about it.)
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This speaks to my theory that it is exposure to music that is really important in develping perfect pitch & musical ability. Your son didn't get training, but he had music around him & a demonstrated interest. Parents playing instruments is much more than background noise. He had to absorb the flow & almost by osmosis, pick up an ability to recognize musical patterns, etc. </p>
<p>I'd be interested in seeing an experiment where kids from a culture that only has, say, pentanomic scale music, are played a piece of music in a western style & asked to sing back the notes. I wonder if they could, as some notes would strike them as quite odd or out of place. I don't believe anyone is born with perfect pitch. My kids have it, but they were exposed to good music from birth. Their ability to pick up new instruments & play them comes, I think, from their success on a previous instrument. Their understanding of music has become so internalized, coupled with the confidence of playing other instruments, that they can move ahead quickly. I compare it to the absolute fearlessness of young kids as they explore technology. Hand a new cell phone to a seven year old & he'll push every button to figure out all the features. Hand that same phone to your 80 year old grandma & she might be quite intimidated, despite having an equal amount of intelligence & natural curiosity.</p>
<p>I agree with the earlier post about talent perhaps being an ability to pick up the skill rather quickly & this positive reinforcement resulting in a more eager pursuit of the skill.</p>