Strange coincidence ... I'll be giving myself the Kenton biography "This Is An Orchestra" by Michael Sparke for Christmas, and when reading it will no doubt delve into the "Artistry In Rhythm" bio by William F Lee too that came into my possession a couple of months ago (I haven't tackled  that one yet, although glancing through it I have some misgivings - e.g. about how contemporary press coverage is worked into it, and excessively quoted at length). But I now did print out that Guardian writeup about Leslie Kenton's book as well and filed it in the Lee biography "for permanent reference". This thread from 2010 had in fact slipped my mind, and the link in the opening post is dead anyhow. So thanks for posting this, Andrea! (Though admittedly I am not sure I'd want to get the book - yet ...)

Yes, that's quite possible. I was just "echoing" and confirming what John L said about discographical information being available throughout for what had been released previously. 

Agreed. Black Is The Color contains one of my very favorite Henderson solos—on "Vis-A-Vis":  

It's been a family tradition to see them in concert, but tickets sold out pretty quickly this year, so we missed the show. Great guys. Last year I sketched the concert on canvas and the band signed it. Pretty cool experience. If my phone cooperates with my email, I'll post it. 

Been mentioned already, mentioning it again, brilliant record, maybe his best: