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  2. A fairly reliable way to tell the difference between major and minor keys

“In a study non-musicians were able to identify minor-key tunes but only once told they sounded "sad." Most Western music is played in a major key: 97 percent of popular American songs, and 73 percent of classical music is in a major key.”

Reference: http://scienceblogs.com/cognitivedaily/2008/05/nonmusicians_can_identify_mino.php

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