Nice piece, except that those questions towards the end of this piece will definitely get different answers depending on a lot of variables like the demographic, age group and also depending on the yardstick you will want to use to compare Michael and Beyonce. Not to take anything away form Beyonce's coachella performance...it was nothing less than a marvelous performance.
Finally, if i get you right, saying "She turned a music festival into her own I'M Back Tour!" got me confused... She hasn't ever left the stage for her to need to make a "I'm back tour". She just used the brilliant performance to build up on her brilliance I suppose.