A check reveals that it takes about eight years of college(including medical school)and some internship(1 to 3 years) to become an eye doctor(who makes a salary of from $100,000.00 to $350,000.00 yearly). A CNA certificate can be earned in a year or less. Your salary would be between $20,000 and 35,000 yearly. You only need a high school diploma or equivalent. It is very difficult to get into medical school, and it is very costly. It is very easy to get training to become a CNA, only calling for a high school diploma or the equivalent. I would suggest to anyone interested in becoming a CNA to look at becoming a registered nurse as a final goal, even as one worked as a CNA.
A person interested in becoming a MD would really need to start preparing in high school, because you really have be focused when you graduate. And you must make excellent grades in premed courses in college if you mean to get into a medical school. Unless you are rich, get ready for some serious debt on college loans. To say that the way would be difficult would be a gross understatement. The final rewards are worth it, but one must be prepared for all the factors involved going in and have your mind set.
Music is fun, but it often doesn't pay much. If you make a good living wage in a music career you have done well, and done so doing something you love to do. That has value.
As a sideline/second salary/or volunteer occupation it is great and somewhat easy to achieve, even as an amateur. That is where I have fitted in, and I wouldn't change it at all. Of course, some hit it big. Maybe that would be you.