He compared the work of the remixers as ``as subtle as a jackhammer, whether it's on the metallic-flaked ''American Life`` by Headcleanr or the '90s-retro Nevins mix of ''Nothing Fails``. On all these mixes, Madonna sounds as if she's out of step with the music of 2003''. Erlewine also compared Spears' vocals with that of Madonna's during her early days and Aguilera's with that of Cher's.
Spears
Madonna