I don't buy the premise that the classical music world has been in a long slumber. Performers have always been free to improvise or do anything they wanted with music - I'm not aware of anyone standing over them saying to the effect of thou shalt not. If there's an audience to buy it then great, more power to them. However, just as one is free to take a copy of a Rembrandt, da Vinci, Klee, or what have you, and add their own colors to it, after all is said and done, and you wash the recently-added affectations off, you are still left with the masterpiece that was necessary to start with. I think it's been the public that's been in the slumber, not the art itself, deadened by media sensationalism and instant gratification. Let musicians go where they will with their improvisations, the masterpieces will survive just as they have decades of bad interpretations.