I was at this show. It was my first concert...ever!!! Ace ("How long has this been going on?") was the opening act. Joe Cocker was advertised as the second act. After Ace played, the local DJ announced that Joe couldn't make the show and a new band would be taking his place...Kansas. I absolutely loved their first album, being a drummer (and still do drum)!! And then YES...opening with 'Sound Chaser' ... I was, to say the least, blown away!!
If my memory cache is acurate, they also played 'Ritual' that night.
What a way to be introduced to concerts...thanks to my brother, Dave.