Conquests of Camelot: The Search for the Grail

I am always hungry. I must always be fed. The finger I lick will soon turn red. What am I?
FIRE

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

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

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

Bright as diamonds. Loud as thunder. Never still. A thing of wonder. What am I?
WATERFALL

I go around in circles. But always straight ahead. Never complain. No matter where I am led. What am I?
WHEEL