Wonderful masterclass by Harnoncourt coaching the Simon Bolivar Orchestra -- with Dudamel translating!
https://www.youtube.com/watch?v=VVFRjIfnzeY
https://www.youtube.com/watch?v=YvnizM_Ea2Y&feature=relmfu

There's a spot where he says "repeat each time with more emphasis." To demonstrate he says:
yes Yes YES YES!! YES!!!!!!