Conversation so far:
What important event happened in Duke Ellington's early post years?
In 1951, Duke Ellington suffered a loss of personnel: Sonny Greer, Lawrence Brown and, most importantly, Johnny Hodges left to pursue other ventures, although only Greer was a permanent departee.
Why was Duke Ellington forced to disband?
The big band era appeared to have ended after the war, and Basie disbanded the group.
Did Duke Ellington tour at all?
Following an appearance at the Newport Jazz Festival, in July 1956, Duke Ellington and his orchestra enjoyed a major revival and embarked on world tours.
What did Duke Ellington's playlist include?
Duke Ellington's playlist include normally included jazz music.
What did people think about Duke Ellington's music?
Martin Williams said: Duke Ellington lived long enough to hear himself named among our best composers.“

Question: Why did his music appear to be outmoded?
Self-contained rewrite: Why did Duke Ellington's music appear to be outmoded?