Leoš Janáček

An innovative composer of music that often sounds deceptively simple:
He found inspiration in the intonations of this native Czech language by notating speech fragments he heard as melodies.



Russian composer Scriabin in a jazzy(!?) mood  - the 2nd of his op. 57 pieces (composed in 1908).
The Preludes op. 74 are more typical of his style and sound world:

And a score + annotation (scroll down) of the harmony underlying these piece.