Sorry Roger, got excited there for a mo... Doesn't happen often, at my age.

Jim, I am trying to imagine the singing equivalent of a motorway U-turn; too extreme. But I often take sideroads on the way to frequent destinations, for a change. The singing equivalent of that wouldn't be too bad, I think. But I have beaten this metaphor to death...

In reality, I think there is a limited number of nuances (to the meaning) one could impose on a song, because there has to be some "hook" for it to stick, no matter how tiny; it's a murder, or a suicide, or an accident, full stop. Overall interpretation gives more options for "straying" from one's usual rendition. You indicate your preference for a standard interpretation (standard for the particular performer, that is), but you also indicate that you don't mind subtleties being introduced each time. I would have called that giving different interpretations... I think I am using different meanings to the words from you and end up being confused.