"As soon as anybody does one of my songs, I rejoice. This particular case of all these great singers doing my work - the implications are very rich and the temptation to think of the outcome of these masses of the mainstream injecting my work into the marketplace, it's a very sweet speculation."

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Earlier in this century, the Heisenberg Principle established that the very act of observing a natural phenomenon can change what is being observed. Although the initial theory was limited in practice to special cases in subatomic physics, the philosophical implications were and are staggering.

— Al Gore