It's a combination of melody and lyrics, not one without the other. It's a confluence of these different elements that makes something powerful.
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One of the best pieces of advice I ever got was from a horse master. He told me to go slow to go fast. I think that applies to everything in life. We live as though there aren't enough hours in the day but if we do each thing calmly and carefully we will get it done quicker and with much less stress.