I find it a fascinating and enlightening exercise to listen to familiar 'tunes' done by both the original artist in different venues as well as 'covered' by other artists. This activity emphasizes to me the centrality of individual creativity and stylistic differences; while the true essence of the music and lyrics are expressed and preserved at the same time you are compelled to undergo an expansion of your appreciation of the piece. Contrast this to an imaginary concert in which 30 'different' and 'individual' Elvis Impersonators all performed renditions of 'Blue Suede Shoes.' I hardly believe my appreciation of the song or the process of performing the song are deepened or enlightened by a mechanical attempt to reproduce the original effects of the 'king' during his performance of the piece.
The question hidden within the above hypothetical 'mind' concert is what is the true relationship between the Evidence Based Medicine movement and the practice of medicine? Should it be analogous to my playlist of versions of 'All Along The Watchtower' or rather a concert of 'Elvis' Impersonators?