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feel stupid, but what does pitchy mean?? i actually don't know what pitch means. does it mean it went on/off key??
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See
wikipedia for a link on pitch. Basically off key and pitchy are the same thing.
But pitch does have a subjective value so it may be possible that occasionally the live audience (including the judges) may perceive a performance as different than the TV audience because of what overtones and other sound features are transmitted.