I didn't sound anything like Capote at the screen test. It was more like Bob Dylan. In his early years. With the flu.
If one takes all the styles in jazz harmonically from the earliest beginnings to the latest experiments, he still has a rather limited scope when compared to the rest of music in the world.
The real exertion in the case of an opera singer lies not so much in her singing as in her acting of a role, for nearly every modern opera makes great dramatic and physical demands.