What are the comments about Rivers' playing?
Do they also offer any explanation as to why they left off the other two concerts with Rivers in Japan that were recorded by Columbia?
To quote Bob Blumenthal: "The Tokyo performance, which may not give a fair sampling of what Rivers brought to the band, was among the last of his tenure" (p.78). - italics are mine.
also
"Chambers [Miles' biographer, Jack] also suggests that the music was toned down for the Japanese" (76). -Perhaps Miles told Rivers to refrain from playing too "out".
I'm not sure why they left the other two concerts off of the set; maybe because they were not "official" releases at the time.
Did Columbia record these concerts, and do they "own" them?