The art of music is like an ocean. It is vast and deep. One could go for a swim and come back feeling refreshed. This is what most listeners do. One could take a boat out into the sea and return with a haul of fish. This is what many students do. Or, one could dive deep into it and emerge with invaluable treasures. This is what master musicians do.
Listen to the series of video lecture demonstrations by Sangeet Samrat Shri Chitravina N Ravikiran on common mistakes made in Carnatic Music. This is a very informative section for music appreciation, learning and performing.
Voice is an instrument , an integral part of the body, which can also be trained and tuned. It is probably one of the most beautiful and versatile god given instruments. The most important aspect of a good voice production is the ability to bring out the purity and richness of sound. I would say that a single sustained note given with utmost purity and fullness , filled with ‘nadham’ can produce an effect not even equal to a complex bhriga laden phrase.