The toddler must say no in order to find out who she is. The adolescent says no to assert who she is not.
Adolescence is the conjugator of childhood and adulthood.
I progressed through so many different styles of music through my teen years...
It's very much like opera singers. They do the same thing. The first thing in the morning and the last thing at night the thing they think about is their voice and how to take care of it.