I noticed with older songs that I perform that I'm coming from a different place with them now...it mutates the vibe and even the meaning of the same words when you have a different spirit, if the person singing is different. I like that, to be able to sing an emotionally wrought song from a more centered place, or to sing an eager, youthful song from a more experienced place. It kind of colors the songs differently, and it keeps them fresh.