It was a tape I made from PBS years ago ~~ wasn't ACL, but another show that was current at the time, the name won't come to me at the moment. (On Stage, Back Stage, Front Stage, ??????? Seems like it was taped in Chicago) I am not exactly sure where the tape is right now either, but I do know that (sadly) it is not complete. Back then tapes were expensive, and I copied out just what I considered to be the best parts, something I would never have done in more recent years, especially since tapes have dipped under a dollar apiece. I do remember paying the better part of a twenty way back when, so there were LOTS of slp and edited tapes in those early years. Now I have more tapes than I know what to do with, or to find, for that matter. I'll try to dig it out and give a report. It needs watching again anyway.
As to which two made the record, that is easy ~~ the older two before Suzzie was old enough to join them, at least that is the way I heard it.