I have seen the brat pack videos. Also, you should check some of the other things on YouTube. He would drop in on Johnny Carson unexpectedly, and they had this routine going on that was pretty funny. There is another with Bob Hope and some others, and they are all drunk and doing really silly stuff on television. That was in the '70s, when I think television censors started to loosen up a bit.
I believe the last of the old timers is Tony Bennett, and I think it pretty amazing that he is still recording and singing!