Dixieland Jazz was appearing with background age made as necessity to need profittable value at amusement environment at 20century capitalism's heyday.

That necessarily demanded rhythmic beat. That sound effect must have had been created with emancipating emotion from long gloomy days caused from world war first. Moreover New York Stock Exchange stock plunges on Monday, that was black manday.
However people in freedom Respecting country could have amusement of jazz at listening and dancing with up tempo them and slow cheek danceable tempo them in discerning according to each occasion, that TPO sensibility must have sustained their tough and harsh days at getting over any crisis.

However, people at 20century ran to another war, that was world war second. Necessarily at Freedom Respecting country had so emergent mood at people's mind, but they could never forget amusement, of course, at any other cultural and liguistic zones had own music trend. Nevertheless, probably the trend made with danceable rhythmic tempo and so kind of making accord along own physiolosic nature to music temp must be spent at these days either.
Certainly at 60th in 20century, very distinct trend was exploding. That was topically conscious movement as message songs sung by many youths, that symbolized presence was Bob Dylan and with the influence from him and other fellows, the Beatles or so appeared and made some so impressively strong boom in all over the world.

Rock movment had a climax at 60th mid-term and gradually it could have mode changing with danceable rhythmic demand by popularities and some kind of blend music with crossover and fusion, and with a great help of synthecizer's popularization and its newly updated models next to next were pioneered and techno pop or so were created at 80th.
But that trend shift was made with a great help of Afro ethnic indentified many great singers with Soul, Gospel, Rhythm and Blues or so and made either disco boom at liberalism countries' cultural zone.
Except Rock music invation with British invasion by the Beatles or so and Wood Stock concert driving public opinion with many youths those days, almost at popular music scene, any kind of site in this world must have demanded so daiceable rhythmic beat and up tempo them.
That is applied either to nowadays, because any superior music tunes and songs played and sung by now active artists are almost so danceable with any ethnic indentified ones.

That must be our human nature's proof that we must need a amusing and enjoyable vivid rhythm for getting over many gloomy emotion urging situated crisis, in other words, except so experimental term as 60th, almost popular music sites have had demanded and followed so ardently to very rhythmic body felt biorhythm stimulating and exciting our potential savageness to have surfacing to our mind. That must be our very biginning days' ancestors' memory is inhered to our sensibility and we can switch it into our subjective sensitivity.
That our dispositional nature must have been evidenced with these refference to 20century bigenning days to nowadays of about 1century pupular music history.

(to be continued)
Jan. 23rd. 2021