Rudolf Cicko
I arrange music for solo piano and build software: apps that teach, tools that explain, and games that are simply fun to play.
Experience
- 2024 – nowSoftware Engineer, Daytrip
- 2021 – 2024Software Engineer, IBM
- 2017 – 2021Working at different companies
Audience
18 873
followers across 5 networks, as of 26 Oct 2026 (Metricool)
Five modes of work
A string vibrates in modes: the first in one arc, the second in two, and so on. Here, each mode is one kind of work.
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Apps
Small, focused apps: a home for musicians, daily lessons, languages and ear training.
All apps- MusicoNet The social network for musicians: show what you play, find bandmates, get booked.
- Daywise A few minutes of general knowledge a day: short lessons across 53 topics.
- Čiriklo Learn Romani in short, playful lessons, for Czech speakers.
- Slavij Learn Interslavic, the language most Slavic speakers understand without studying it.
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Software
New software is on its way.
All softwareMore here soon.
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Scores
Every score is my own arrangement. Pay once and download the PDF straight away: no account, no subscription.
Open the scores shopn = 4
Book
A growth playbook for the age of AI agents, coming soon on Amazon.
About the book
From Zero to a Million Users
A growth playbook for the age of AI agents
A practical, funny growth playbook for people building products with AI, from the first user to the millionth.
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Games
A hundred-player brawler in the browser.
All gamesWhat you are playing
fn = n f0√1 + B n2
Each string is a stiff steel string fixed at both ends. It vibrates as a sum of modes, and stiffness pushes the higher ones sharp; B grows about tenfold every two octaves up the treble. That stretch is why pianos are tuned slightly wide.
x0 = L/8
The felt hammer strikes an eighth of the way along, at a node of the eighth mode, so that partial never sounds. Harder blows shorten the contact time to a millisecond or so, which brings out the upper partials: loud notes are brighter.
|fm − fn| < 12 ¢
With the pedal down, every damper lifts. Any string with a partial within a few cents of a partial you play picks up energy and sings along quietly: sympathetic resonance. The sound is synthesised from the same modes you see.