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Show HN: Runtime Fence – Kill switch for AI agents

https://github.com/RunTimeAdmin/ai-agent-killswitch
1•ccie14019•2m ago•1 comments

Researchers surprised by the brain benefits of cannabis usage in adults over 40

https://nypost.com/2026/02/07/health/cannabis-may-benefit-aging-brains-study-finds/
1•SirLJ•4m ago•0 comments

Peter Thiel warns the Antichrist, apocalypse linked to the 'end of modernity'

https://fortune.com/2026/02/04/peter-thiel-antichrist-greta-thunberg-end-of-modernity-billionaires/
1•randycupertino•5m ago•1 comments

USS Preble Used Helios Laser to Zap Four Drones in Expanding Testing

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2•breve•10m ago•0 comments

Show HN: Animated beach scene, made with CSS

https://ahmed-machine.github.io/beach-scene/
1•ahmedoo•11m ago•0 comments

An update on unredacting select Epstein files – DBC12.pdf liberated

https://neosmart.net/blog/efta00400459-has-been-cracked-dbc12-pdf-liberated/
1•ks2048•11m ago•0 comments

Was going to share my work

1•hiddenarchitect•14m ago•0 comments

Pitchfork: A devilishly good process manager for developers

https://pitchfork.jdx.dev/
1•ahamez•14m ago•0 comments

You Are Here

https://brooker.co.za/blog/2026/02/07/you-are-here.html
3•mltvc•18m ago•0 comments

Why social apps need to become proactive, not reactive

https://www.heyflare.app/blog/from-reactive-to-proactive-how-ai-agents-will-reshape-social-apps
1•JoanMDuarte•19m ago•1 comments

How patient are AI scrapers, anyway? – Random Thoughts

https://lars.ingebrigtsen.no/2026/02/07/how-patient-are-ai-scrapers-anyway/
1•samtrack2019•20m ago•0 comments

Vouch: A contributor trust management system

https://github.com/mitchellh/vouch
2•SchwKatze•20m ago•0 comments

I built a terminal monitoring app and custom firmware for a clock with Claude

https://duggan.ie/posts/i-built-a-terminal-monitoring-app-and-custom-firmware-for-a-desktop-clock...
1•duggan•21m ago•0 comments

Tiny C Compiler

https://bellard.org/tcc/
1•guerrilla•22m ago•0 comments

Y Combinator Founder Organizes 'March for Billionaires'

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1•hidden80•23m ago•2 comments

Ask HN: Need feedback on the idea I'm working on

1•Yogender78•23m ago•0 comments

OpenClaw Addresses Security Risks

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2•vedantnair•23m ago•0 comments

Apple finalizes Gemini / Siri deal

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1•vedantnair•24m ago•0 comments

Italy Railways Sabotaged

https://www.bbc.co.uk/news/articles/czr4rx04xjpo
4•vedantnair•24m ago•0 comments

Emacs-tramp-RPC: high-performance TRAMP back end using MsgPack-RPC

https://github.com/ArthurHeymans/emacs-tramp-rpc
1•fanf2•26m ago•0 comments

Nintendo Wii Themed Portfolio

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2•s4074433•30m ago•2 comments

"There must be something like the opposite of suicide "

https://post.substack.com/p/there-must-be-something-like-the
1•rbanffy•32m ago•0 comments

Ask HN: Why doesn't Netflix add a “Theater Mode” that recreates the worst parts?

2•amichail•33m ago•0 comments

Show HN: Engineering Perception with Combinatorial Memetics

1•alan_sass•39m ago•2 comments

Show HN: Steam Daily – A Wordle-like daily puzzle game for Steam fans

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1•itshellboy•41m ago•0 comments

The Anthropic Hive Mind

https://steve-yegge.medium.com/the-anthropic-hive-mind-d01f768f3d7b
1•spenvo•41m ago•0 comments

Just Started Using AmpCode

https://intelligenttools.co/blog/ampcode-multi-agent-production
1•BojanTomic•43m ago•0 comments

LLM as an Engineer vs. a Founder?

1•dm03514•43m ago•0 comments

Crosstalk inside cells helps pathogens evade drugs, study finds

https://phys.org/news/2026-01-crosstalk-cells-pathogens-evade-drugs.html
2•PaulHoule•44m ago•0 comments

Show HN: Design system generator (mood to CSS in <1 second)

https://huesly.app
1•egeuysall•45m ago•1 comments
Open in hackernews

Scanned piano rolls database

http://www.pianorollmusic.org/rolldatabase.php
84•bookofjoe•6mo ago

Comments

irrational•6mo ago
It’s dead Jim.

I assume we hugged it to death.

ncr100•6mo ago
It's buckling. Keep trying if you're interested in it.

Or visit https://web.archive.org/web/20250716215135/http://www.pianor... to see SOME of the files. Sadly not the MIDI files ... which IMO are the meat of value of this HN post.

JKCalhoun•6mo ago
Super cool. Clicked on a title with the MIDI indicator and a MIDI file (.mid) downloaded. Came up in Garage Band and sounded nice.
ncr100•6mo ago
Awesome.

Did the same for Laugh Clown, Laugh - set the tempo to 110 bpm:

http://www.pianorollmusic.org/html/mjose/midifiles/NonPDfile...

bluGill•6mo ago
If you find a duplicate it often isn't. They often cut a bunch of rolls and then threw the master. If the roll proved popular they made a new master which would be slightly difierent but have the same catalog number. Tracing these 'editions' is often part of the fun.
masfuerte•6mo ago
If you want to play these in VLC you need a SoundFont (.sf2) file. There's a good list of SoundFont files here [1]. This VLC wiki page [2] explains how to configure VLC to use the SoundFont.

[1]: https://github.com/FluidSynth/fluidsynth/wiki/SoundFont

[2]: https://wiki.videolan.org/Midi/

(I'm posting this because the vlc wiki is stale and sent me down a pointless rabbit hole on fluidsynth's old sourceforge site. I'd rather update the wiki. It tells me I need to create an account. When I try it tells me I don't have permission.)

zulko•6mo ago
This used to be one of my main hobbies, I listened to thousands of these and I am super grateful to the people scanning and hosting these collections.

Some software I wrote for piano roll analysis and transcription:

- Unroll: https://zulko.github.io/unroll-online/ - upload a piano roll midi file and have it quantized and converted to lilypond sheet music. More about the process in this blog: https://zulko.github.io/blog/2014/02/12/transcribing-piano-r...

- Pianola: https://zulko.github.io/pianola/ - upload a piano roll midi file, and it plays with the piano roll and keyboard animation (you can zoom on some parts, slow down etc).

Some transcriptions made with these tools:

- Hindustan: https://github.com/Zulko/sheet-music--hindustan

- Gershwin - Sweet and Lowdown: https://github.com/Zulko/sheet-music--Gershwin-sweet-and-low...

- Gershwin - Limehouse Nights: https://github.com/Zulko/-sheet-music--Gerhswin-Limehouse-Ni...

StarlaAtNight•6mo ago
Just curious, what made you go down that rabbit hole?
zulko•6mo ago
When I was about 10 I picked my first ever CD at a music shop, and it was a recording of the Gershwin piano rolls, because the cover photo caught my eye [1]. I didn't really understand what I was listening to, I assumed "piano roll" was a musical genre, like "rock'n'roll", until years later when my English became good enough to read the CD's booklet.

It was also a time when all these midi files started being available, like the 6000 rolls from Terry Smythe [2], and I figured out transcribing these could be a good way to learn old-school Jazz, which is otherwise difficult to find as sheet music.

[1] https://www.youtube.com/watch?v=BX9MCyO6smk

[2] https://archive.org/details/terrysmythe.ca-archive/mp3s/Ampi...

vintagedave•6mo ago
Does a piano roll sound different (I assume it does)? Ie, is or was there a specific market for a CD of a piano roll specifically, not, of someone playing the piano?
zulko•6mo ago
In terms of the music being played, piano rolls can be different from "normal piano music" because it's not played live by a real human, so it can have complex parts with full chords, additional voices, all with perfect rhythm and no wrong notes. This can be very compelling when well executed on the right songs (and it can also sound "mechanical" on others).

There isn't a huge market for piano roll recordings, and these recordings are rare. It's a niche topic that can attract

- Older people who have known the time piano rolls (say, until the 1950s)

- People nostagic of old times in general (in particular the 1910s-1940s), the age of early jazz with stride piano and early Broadway.

- Music scholars, because some of these rolls are of historical/musical importance, in particular those "recorded" by George Gershwin or Fats Waller and other big names. A lot of material exists only as piano rolls.

For the example of the Gershwin CD I posted above, it was produced by musicologist Artis Wodehouse [1] in parnership with the yamaha disklavier pianos iirc [2], so my guess is this was a passion project above all, with a bit of Yamaha marketing.

[1] https://www.artiswodehouse.com/biography/ [2] https://usa.yamaha.com/products/musical_instruments/pianos/d...

vintagedave•6mo ago
What makes them interesting to you? Does the music sound different?

I've seen pianola rolls and even played one as a child. But I have wondered as an adult what the 'listening quality' of the music is / would be. What got you into them and could you share -- if you want to nerd out please do, I'm genuinely interested! -- what interested you about them?

willtemperley•6mo ago
Hearing Debussy playing Debussy is magic enough for me.
gus_massa•6mo ago
Do you have a permalink?
willtemperley•6mo ago
https://m.youtube.com/watch?v=W3NX_TrxfVk&pp=0gcJCfwAo7VqN5t...
prvc•6mo ago
An interesting prospective project for a technically minded musician would be would be to find an automated way to "correct" the surviving corpus of Welte-Mignon[1] recordings. They were designed to capture the small nuances of performances (such as dynamics), and a large number of historically important musicians made recorded performances in this medium before the era of sound recording. In my strongly-held opinion, the rolls were marked in an uneven and imprecise way, making direct playback on anything but the original recording apparatus inaccurate. A common trait of modern renderings of these rolls as sound recordings (as found on CD or on Youtube) is an unevenness of tempo and a seeming lack of synchronization of voices (really piano keys). However, the mechanical quirks and imprecision in the recording apparatus must be regular enough to allow for a more accurate version of the performances to be reconstructed, without relying on unduly many aesthetic assumptions.

[1] https://en.wikipedia.org/wiki/Welte-Mignon

iainmerrick•6mo ago
I learned about this a few years ago and was delighted to hear some actual performances by Debussy of his own pieces. I was unimpressed by the quality of the recordings, though (via replaying on a restored mechanism) so it's great to get a MIDI version now!

How did the Welte-Mignon actually work? It seems almost miraculous that the dynamics can be captured on a piano roll and replayed successfully. Not perfectly, as you say, but pretty damn close.

Bluestein•6mo ago
"The neverending piano": Feed these to a tokenizer, vectorize, generate ... forever.-
bookofjoe•6mo ago
At the bottom of page 1:

>Because of U.S. copyright restrictions, only songs published in 1929 and earlier available for public download from this page.

ryandvm•6mo ago
What am I missing here? There are a list of piano rolls that have been scanned but you can only download MIDI from before 1929.

I mean, I understand copyright and public domain law in the US, but what exactly is the point of a list of things you can't share?

waffletower•6mo ago
It is a shame that you can't access the scanned piano rolls of Conlon Nancarrow's player piano music in an archive like this. The scans do exist apparently, but are merely documented on the web (https://www.paul-sacher-stiftung.ch/en/research/1-2-Conlon-N...) without explicit download access. An incredibly comprehensive Youtube video exists however: https://www.youtube.com/watch?v=AfmVJmQKdj4