By eHow Arts & Entertainment Editor
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The piano has 10,000 movable parts, including 52 white keys and 36 black keys. The way you strike those keys determines the song you play and the way it sounds. For example, a minor key evokes a suspenseful or depressing mood, and a major key sounds more positive. You can easily switch from major to minor keys on piano, if you have first learned the scales of the keys.