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?