Everyone's voice is unique. No two people are going to sound the same, therefore they cannot be taught with the assumption that one "trick" will work for every singer. That being said, the methodology I use is being performed on some of the largest stages in the world.
The voice is muscle and membrane and like any other part of our body, there are right ways and wrong ways to work it. My focus, for every singer, is to walk away singing in a healthy and sustainable way. I do this by staying up to date on the latest vocal science and teaching the voice as the body part it is, not by trying to coach it into something pushed or forced into a specific style or genre.
And you can sing anything! Opera, musical theater, pop, rock, jazz... whatever you are interested in. What's important is that the technique stays the same and you build a habit of health. Any style of music can be sung with a healthy technique.
The piano is one of the best instruments for all ages to start learning. Not only because it's a great instrument, but also because it allows us to fully study the complexity and beauty that is music.
During piano lessons, we will be following specific texts and working through them methodically, but with the flexibility to allow for the student's interests. Along the way, I make sure to cover necessary and age appropriate music theory concepts at a level and speed that the student can keep up with. It is more important that a student walk away understanding how to read music and play on the beat, than it is for them to jump ahead to more advanced music that they couldn't teach themselves.
For both piano and voice, you get out of it what you put into it. I suggest students see me for either an hour or a half hour per week, depending on their age. But that shouldn't mean that's the only time you touch your instruments! Daily or every other day practice is the only way to keep moving forward and improving.