I was doing some research last night and stumbled across this video. I’ve always admired Kristin Chenoweth so I gave it a view. The performer is singing impressionist Christina Bianco. She did an admirable job jumping from style to style. I thought it was worthy enough to post here.
Style is obviously a personal thing and it’s difficult to say what Christina’s own style would sound like, but certainly knowing the fundamentals is the key before attempting what Christina has in this video.