I fucking hate it when big acts change their songs at concerts

I saw Bob Dylan live a couple years ago and could barely recognize most of the songs... Highway 61 Revisited was only recognizable when I heard sort of a mumbled, quasi-audible "hawagh sixty wuuunn" for instance. The fact that he really, really, really can't sing at all anymore didn't help, but I ended up being pretty disappointed with it. Ah well.