This recording features an amusing incident between Roger Waters and Richard Wright, with Roger asking if Richard was ready. The transcript of the conversation goes like this, with Richard playing about here and there on the keyboards:
Roger: "Are you nearly ready Rick?"........"Richard?"........"Richard?"....... "Richard are you ready? ... Are you ready?" ....... "Are you ready?" ....... "Rick?" ....... "Rick?" ....... "Richard, Richard?" ....... "Richard are you ready?" ....... "Rick?"
Man laughs in the audience, then other people laugh & cheer & whistle, man continues to laugh.
Drum roll from Nick Mason, and finally Rogers says, "OK!".