Conquests of Camelot

Hints:
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Riddle Solutions
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My life can be measured in hours. I serve by being devoured.
Thin, I am quick. Fat, I am slow. Wind is my foe. What am I?
CANDLE
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I am always hungry. I must always be fed. The finger
I lick will soon turn red. What am I?
FIRE
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At the sound of me men may dream or stamp their feet.
At the sound of me women may laugh or sometimes weep.
What am I?
MUSIC
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To unravel me you need a simple key. No key that was
made by locksmith`s hand. But a key that only I will
understand. What am I?
RIDDLE
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Bright as diamonds. Loud as thunder. Never still.
A thing of wonder. What am I?
WATERFALL
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I go around in circles. But always straight ahead.
Never complain. No matter where I am led. What am I?