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Breather

17/12/2025

5 Comments

 
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If anyone wonders what the above is, it's the deterministic solution to a hairy engraving computer science problem nobody thought was solvable. It's been like that since the 80s. Everybody has just kind of capitulated and lived with a 'it's 95% okay, the rest is impossible' type of mindset and then, as one must in that situation, used rules-of-thumb to reach that 95%. Which is a lot, and a very respectable achievement.

However, it turned out that Functional Programming and immutability - and non-consing push transducers - could solve the problem deterministically. For the first time ever.

​I think it holds. We shall see.

What it would mean for notation? No accidentals weirdness. No cleanup. Consistency. Adjustments for taste, not necessity.

The power of Clojure, of treating the piece as a transforming semantic stream, and of not working with OOP and mutable state.

Now I need to sit down and breathe for a while. Time to go into Hammock Mode. I need to get my head around this.
5 Comments
Magnus Johansson
17/12/2025 14:20:31

Vilket öft [What a spell], Peter! It will be very interesting seeing the result in program action later.

Reply
Roland Gurt
21/12/2025 09:02:10

Dear Peter Bengtson,

I don’t know how many of the people following this project are musicians, and how many are programmers (or both), but I for one would love to see a blog post where you could explain terminology like functional programming, immutability, transducers in layman’s terms / for musicians. After all, I think everyone following the project at this moment must be curious enough to be interested in that field, which feels a bit impenetrable from the outside.

Best regards,
Roland

Reply
Peter Bengtson link
21/12/2025 17:56:06

Dear Roland,

I’m really glad you asked this. I’ll happily take you up on it, because I think it’s important at this stage of the project, and you asking about these things validates going into detail about these highly technical details and why they are so central to Ooloi.

It will still be abstract in a sense, but explicitly aimed at explaining terms like functional programming, immutability, and transducers in layman’s terms and from a musical point of view. I’ll post it in a few days, likely on the other side of Christmas.


All the best,
Peter

Reply
Peter Bengtson link
21/12/2025 23:52:12

Here you go! :)

https://www.ooloi.org/home/computer-science-for-musicians

Roland Gurt
23/12/2025 11:52:53

Dear Peter, thank you so much! It's amazing how quick you are. I will read it with pleasure!




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    Peter Bengtson –
    Cloud architect, Clojure advocate, concert organist, opera composer. Craft over commodity. Still windsurfing through parentheses.

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Ooloi is a modern, open-source desktop music notation software designed to produce professional-quality engraved scores, with responsive performance even for the largest, most complex scores. The core functionality includes inputting music notation, formatting scores and their parts, and printing them. Additional features can be added as plugins, allowing for a modular and customizable user experience.

​Ooloi is currently under development. No release date has been announced.​


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