Rok, those two Sam Lazar links are very important; using your Harvey, Sam Stewart analogy, that was as close to any music I could find that Harvey was playing that Summer. Listen as well as you can through the distortion.
Sam Lazar was like a shooting star; he burned brighter than any of the other stars for a minute or two, and then went out. Fortunately, he played many local clubs, and I caught him as much as I could.
Sam Lazar was an American pianist and Hammond organist originally from St. Louis, Missouri. A mysterious figure who disappeared from the music scene in the early 1960s He is best known for fronting a group that included early work from guitarist Grant Green. His first LP on Argo Records approximates his birth year as 1933. Initially a pianist, Lazar played in Ernie Wilkins group before Wilkins left St. Louis to join Count Basie. This was followed by a stint in George Hudson's big band which also included Clark Terry and Jimmy Forrest at various times. After a tour with alto saxophonist Tab Smith.
In 1958, Lazar saw the Jimmy Smith trio at the Peacock Alley club in St. Louis and was inspired to play the Hammond organ. His St. Louis-based organ combo later included guitarists Grant Green, Joe Diorio, George Eskridge, drummer Chauncey Williams and saxophonist Miller Brisker among others. Not only did the group play a variety of gigs from strip clubs to jazz clubs, but they were reportedly one of the first interracial combos in the area.
Lazar recorded a single on Cawthron Records, and then went on to make several albums in the 1960s for the Chicago-based Argo Records. His first, Space Flight, was recorded in 1960 and added bassist Willie Dixon to his regular working combo featuring Williams and fellow St. Louis musician Grant Green.
He disappeared from the music scene in the early 60's, and nobody seems to know what happened to him. Musicians like him are definitely worth a listen, especially if you can find a CD without so much distortion.
Enjoy the music.