Kosenko Op2 preludes (no 1 in Eb minor was published). I have performed and recorded it (I might have a postable audio file of a rehearsal run through somewhere, to my knowledge there are no extant recordings of it on the web or commercially available lp or cd at this time so I may look for this and throw it out there) , it's pretty cool. Composed approx 1911 which based on Viktor's birth in 1896 means he got this down on paper no later than age 15 give or take.