I have been going to jazz concerts at the Folly Theater in Kansas City since it was restored in 1982. For several years, much of the audience was advanced in age. Unfortunately, not that many of them still attend.
In the late 1980s, the Count Basie band led by Frank Foster played at the Folly. Foster commented from the stage, "it looks like most of you heard the original Basie band before it left Kansas City." That was probably true of the audience back then.
The reason for this discussion--at the intermission the guy sitting behind me said to his friends, "I never thought much of Basie, when I would see him live here in the 1930s. Basie just wasn't that good. Fats Waller now, he was great. Fats Waller was THE man."