Well, it's only a session you're talking about - not a recital at the Albert Hall or whatever.

I know where you're coming from, in that there's songs I sing where I'm still encountering new interesting things about them, and songs I've been singing for years that I still don't feel I do justice to.

But, well, it's a session. Where you might join in on a tune you'd never ever heard before. Sessions don't tend to be 'pin-drop' atmospheres at which everyone hangs off your every vocal inflection.