It remembers me a bit the time I was listening only to Final Fantasy's BGM and for this one I'd say it's a bit the same than Treno in FF IX x3

Brilliant x3 how long did it take you to write it?

honestly? 3 days tops. XD

It sounds so..complex XD do you use rules? Like, theory stuff, or is it just intuition?

For things like this it is best not to have set rules, but rather have a basic chord progression in mind and allow improvisation and virtuoso playing around them in order to embellish the music and show off the musicians' talent. The whole Jazz persona was to go against the standard conventions and rules set in place by the stuffy post-romantic world of the 19th century, especially as it revolved around the newly acquired freedom of expression of the black lower class citizen (slavery had recently been abolished and so ex-slaves could get paid jobs and earn money to buy second hand instruments thrown out by the white orchestras and performance groups, as, especially around the time of the great depression, many music/concert halls were closed down).

(if you want to know more just message me, I did an A-level on the subject XD)

A lot of Jazz music was set around a basic chord progression to set the theme and to define what the band/soloist would play inside the piece but then give them the freedom to expand on what was written. A good way to think of this is multiples of 4 or sometimes (more uncommon) multiples of 2. A piece of 32 bars for example could have 4.4.8.8.4.4, as the length of each chord phrase and so on. Each phrase could be expanded upon by the instrumentalist as they wanted to allow a greater amount of creativity. This is the main reason why, when you listen to live jazz and to recordings of popular songs/instrumentals from the 1920s-40s none of them ever sound the same as each other as each player was allowed the freedom to go against standards of theory and rules.

Very long answer and a bit convoluted, but I hope it helps show what music like this is about

Good on ya!
I noticed the great attention to detail.
It's the littlest of things that separate the good from the great, eh?

I wouldn't know about great *blushes* but i am very harsh on myself with my music, I like things to be just right or not at all

I love it!!

Fantastic! I would hesitate to call myself a fellow composer, as I have only begun to dabble in such things, but I can say that as a lover of music, (especially ragtime) it is well done!