Will you relate noir's rise and fall to trends in other arts? I ask this because I'm reading about the career of jazz trombonist Bill Harris, top of the heap for 1944-1954 in polls. The writer makes an interesting point that Harris was marked by everything BIG, big bands, big sound,...

"He came up during a time when everything in jazz was big – the bands, the sounds, the opportunities, the personalities, the coverage – and this formed and marked him. Everything about his playing – his tone, vibrato, ideas, emotion – was equally big, he was just huge. But after The War and with the advent of bebop, the music got smaller – the bands, the sounds, the emotion, personalities – everything became paler, cooler. Harris did a better job than Norma Desmond in adapting to these changes, but the bigness of his overall conception still stood out and didn’t fit into the newer, smaller surroundings, hastening his trip to the sidelines." https://wallacebass.com/bill-harris-trombone-surrealist/

Big bands gave way to small groups.

It's reaching to say that in movies, the studios were big and even had their own theaters. This gave way too to independents.