Being as versatile as I am, I take offense to the notion that no serious musician would not be doing a late night talk show gig. One has to be open enough in other areas to be able to contribute to a show like this.
I knew I wanted to sing when I was a very small boy. When I was probably 4 years old. My mother played a guitar and I would sit with her and she would sing and I learned to sing along with her.