I saw Savoy Brown in March of 1972 in St. Paul, MN.
They were playing with Fleetwood Mac and Long John Baldry.
For an encore, SB & FM played traditional 4-bar blues for @ least an hour and a half.
No Peter Green by then, but I’m almost certain that both Kirwin and Spencer were present @ this particular concert.
The concert, by the way, is missing from most databases, but searching all three bands will bring it up.
They were no George Gobel mind you, but the encore was memorable.
DeKay