Music is emotional and you may catch a musician in a very unemotional mood or you may not be in the same frame of mind as the musician. So a critic will often say a musician is slipping.
I think it's a mistake where rap music is these days. It doesn't seem to be able to look out of the ghetto and that's ultimately unfortunate because it defines our limitations.
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Great music is in a sense serene it is certain of the values it asserts.
