Yes, Paul!
Was lucky to be acquainted with Demetre when I was writing articles in Jazz Hot in the late 50s.
Demetre had an apartment very close to the magazine headquarters and I spent several afternoons there listening to his collection of 78rpm blues records. A very interesting man.
However I was on even better terms with his co-author Marcel Chauvard whose tastes ranged wider and went beyond blues into the hardbop
productions from BN, Prestige and others (a rare opportunity in the late 50s over here!).