What about the next one, Yesterday, Today & Tomorrow? I have never been able to find that one in the blogosphere, but it looks promising on paper. According to Lord, it is a trio only, recorded in Detroit, and they do tunes like On Green Dolphin Street, Love For Sale, After Hours and Li'l Darlin'. It is coming out in Japan in March, so I have been thinking of getting it.
I have heard most of Gene Harris's subsequent 1974-77 output, and it is indeed 70s Blue Note at its worst, but I had some hopes for the 1973 album.
Y, T & T is more of a mixed bag, imo, then Of the Three Sounds. The title is highly apt as there are "Yesterday" tracks which aren't as great as the original trio but still good, and then there are "Today" and "Tomorrow" tracks that are putrid. For me, that is.
I actually like (most of) YT&T and I think even included one track on one of my blindfold test discs years ago. Dan's right, though, as it's real hit or miss. I think we would have seen this released earlier if it could have fit on one CD (it's a 2-fer LP), but it runs just over 80 minutes iirc and would have had a hard time selling domestically at a 2-CD price point.