Why sing melody before a deaf person?We will be doing many tasks. We will be learning skills and exhibiting them whenever we get a chance to exhibit them. If the people who witness our skills and achievements can recognise our capabilities and wisdom only when they have the capacity to understand what we performed. If they are having the skill even they can point out mistakes if any and advise for our betterment.
A person who knows the Sanskrit language can only understand the Slokas and appreciate the beauty in it. If he has no knowledge he can't appreciate.
If you want to improve your skills or knowledge you should perform before a person who has knowledge in the field and take his suggestion and strive for improvement. What is the use of singing before a deaf person who can't listen to what you sing?