Foster_9, thanks for the "heads-up" on Coltrane. I can't seem to type and spell at the same time.
In regard to "Portrait in Jazz" and "Sunday at the Village Vangaurd", they were recorded 17 years before "Affinity". Bill, like any great artist, made considerable progress in those 17 years. He used a "quintet" for "Affinity". The addition of a harmonica and a sax gave this album quite a different sound from the "Vanguard" sessions, yet retained the continuity of Bill's piano.
He always had the ability to select great artists. "Toots Thielemans" is a musician of the same stature as Bill. While "google" will verify the historical evidence of this, the album will verify the musical evidence. Thielemans later regarded the sessions for "Affinity" as his favorite.
The Fender Rhodes electric piano on some tracks is also something new. I consider some of the music on this album as good as anything in my entire collection. If you have the opportunity, give it a listen.