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I think he means how her way of singing has evolved throughout her career. Obviously, comparing her voice now to her voice 10 years ago, there is a clear difference. I don't know if I quite agree with that list though. I would say poker face to A Song for XX should be one era. I haven't really heard anything past her I am... album closely enough so I can't say anything else about her voice changing. I know for sure that GUILTY to the present is another era. Perhaps My Story all the way up to Secret being another era of vocal change.
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