A Katie is a rare and majestic creature placed here on earth by the divinity of the (rock) gods in order to enlighten the world with her supreme wisdom and fill our ears with ecstacy from her wonderous musical talent. She can play every variety of instrument (metaphorical ones included), and is friend to all variety of animal and living thing. Her beauty has been said to inspire tears of joy in all those that lay their eyes upon her. She is also part cat, and does an uncanny impression of a swan honking.
Who's that sexy thang up there playing guitar? She makes me want to save the world.