Well, they're not COMPLETELY useless. I started playing them from the top with my 14-going-on-24 year old daughter and between us we were getting maybe one in five from the first couple of bars. The first few were ZZ Top, and then several from the Zombies, then Zager and Evans and I forget the others but a dim light began to form in my mind so I have something to go on!
Oh well, maybe a never-ending retirement job; some people like jigsaw puzzles............