Ah Focus!
That brought back some memories.
As mentioned higher up in this thread, back in the 70s promoters often tended to put on a mismatch of acts. In 1973 (perhaps 74) I opened for Focus. Me, one guitar, one voice, doing contemporary folky stuff. All of the audience had come to see Focus, and I had to do a 45 minute set to "warm them up". Ha! Thankfully the audiences were kind and into "cult" alternative stuff, and so I survived.
Focus were... LOUD! One memory was standing at the back of an auditorium at one of the venues, and literally feeling the music. Every fibre in my body vibrated in sympathy with the music. The only other time I have felt that was standing under the end of a runway when Concorde came just overhead and threw on the afterburners.
Focus were a superb group. All of the guys were very accomplished classical musicians too, having been through the Royal Dutch College of Music.
At one of the venues, back in the dressing room after a show, in came Johhny Patrick, at that time a musical director for the BBC, and he showed some original medieval lute tablature to Jan Akkermann who was sitting beside me. Jan reached under the leather covered bench seat, pulled out a lute case, set up the old tablature, and just played it all from sight on his lute. Needless to say, I was pretty impressed.
Thanks for bringing back the memories
Rod