Tunesmith: I see what you are getting at here: a concert by a performer of a particular style throughout (any style), ending on an item in a totally different style (any style) and getting the biggest applause for the latter. I think the reason for this is that people *love* to see a performer (in any performing field or style) doing something totally "out of character": e.g. the generally stiff and starchy BBC newsreaders, who have done song-and-dance routines (very well !) for "Children in Need" charity programmes on TV and so on. It's just plain fun !