It sometimes feels as if every corporate cocktail party or five-dollar-sign restaurant has a requisite jazz trio plodding out standards for diners to ignore. But true fans of jazz music know it demands close attention in the presence of other aficionados, and Cezanne is just the place for that. Crammed into a wood-paneled upstairs room above the Black Lab, Cezanne plays host to some of jazz music’s heavy hitters, such as Horace Grigsby and Bob Henschen, in an intimate setting unlike any other in Houston.