Loved the reaction. if you are especially looking for their covers of Michael Jackson, i would recommend their version of Smooth Criminal. but as always, PMJ is a great channel just to browse their videos as they have a large collection of talented musicians and singers.
Oh I have a lot of their videos in my watch queue and notice they have quite a few vocalists as guests. I just find it amazing how they always seem to manage to find the perfect match for the song and style they are doing. That by itself I think is what impresses me the most. They don't simply look at the vocal talent, but the style fit.