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“Reading Rainbow” was created to combat summer reading slumps

https://www.smithsonianmag.com/smithsonian-institution/to-combat-summer-reading-slumps-this-timeless-childrens-television-show-tried-to-bridge-the-literacy-gap-with-the-magic-of-stories-180986984/
114•arbesman•4h ago•22 comments

Ex-Waymo engineers launch Bedrock Robotics to automate construction

https://techcrunch.com/2025/07/16/ex-waymo-engineers-launch-bedrock-robotics-with-80m-to-automate-construction/
258•boulos•12h ago•210 comments

Original Xbox Hacks: The A20 CPU Gate

https://connortumbleson.com/2021/07/19/the-xbox-and-a20-line/
20•mattweinberg•1h ago•0 comments

I want an iPhone Mini-sized Android phone (2022)

https://smallandroidphone.com/
161•asimops•8h ago•209 comments

I was wrong about robots.txt

https://evgeniipendragon.com/posts/i-was-wrong-about-robots-txt/
52•EPendragon•4h ago•36 comments

AI therapy bots fuel delusions and give dangerous advice, Stanford study finds

https://arstechnica.com/ai/2025/07/ai-therapy-bots-fuel-delusions-and-give-dangerous-advice-stanford-study-finds/
186•pseudolus•3d ago•89 comments

Altermagnets: The first new type of magnet in nearly a century

https://www.newscientist.com/article/2487013-weve-discovered-a-new-kind-of-magnetism-what-can-we-do-with-it/
306•Brajeshwar•14h ago•75 comments

Show HN: A 'Choose Your Own Adventure' written in Emacs Org Mode

https://tendollaradventure.com/sample/
91•dskhatri•7h ago•8 comments

The 1960s schools experiment that created a whole new alphabet

https://www.theguardian.com/education/2025/jul/06/1960s-schools-experiment-created-new-alphabet-thousands-children-unable-to-spell
28•Hooke•1d ago•23 comments

Inside the box: Everything I did with an Arduino starter kit

https://lopespm.com/hardware/2025/07/15/arduino.html
24•lopespm•1d ago•2 comments

Intel's retreat is unlike anything it's done before in Oregon

https://www.oregonlive.com/silicon-forest/2025/07/intels-retreat-is-unlike-anything-its-done-before-in-oregon.html
110•cbzbc•10h ago•161 comments

Blue Pencil no. 18–Some history about Arial

https://www.paulshawletterdesign.com/2011/09/blue-pencil-no-18%e2%80%94some-history-about-arial/
22•Bluestein•2d ago•4 comments

Gaslight-driven development

https://tonsky.me/blog/gaslight-driven-development/
103•theodorejb•4h ago•64 comments

Pgactive: Postgres active-active replication extension

https://github.com/aws/pgactive
276•ForHackernews•19h ago•71 comments

Show HN: Improving search ranking with chess Elo scores

https://www.zeroentropy.dev/blog/improving-rag-with-elo-scores
145•ghita_•14h ago•46 comments

Mistakes Microsoft made in the Xbox security system (2005)

https://xboxdevwiki.net/17_Mistakes_Microsoft_Made_in_the_Xbox_Security_System
43•davikr•4h ago•12 comments

How and where will agents ship software?

https://www.instantdb.com/essays/agents
114•stopachka•11h ago•56 comments

I'm switching to Python and actually liking it

https://www.cesarsotovalero.net/blog/i-am-switching-to-python-and-actually-liking-it.html
379•cesarsotovalero•21h ago•572 comments

Artisanal handcrafted Git repositories

https://drew.silcock.dev/blog/artisanal-git/
130•drewsberry•9h ago•31 comments

Shipping WebGPU on Windows in Firefox 141

https://mozillagfx.wordpress.com/2025/07/15/shipping-webgpu-on-windows-in-firefox-141/
358•Bogdanp•22h ago•145 comments

Remembrance of Scents Past

https://www.newyorker.com/culture/onward-and-upward-with-the-arts/remembrance-of-scents-past
9•prismatic•2d ago•1 comments

Signs of autism could be encoded in the way you walk

https://www.sciencealert.com/signs-of-autism-could-be-encoded-in-the-way-you-walk
113•amichail•10h ago•109 comments

A Rust shaped hole

https://mnvr.in/rust
67•vishnumohandas•1d ago•116 comments

Roman dodecahedron: 12-sided object has baffled archaeologists for centuries

https://www.livescience.com/archaeology/romans/roman-dodecahedron-a-mysterious-12-sided-object-that-has-baffled-archaeologists-for-centuries
54•bookofjoe•2d ago•84 comments

Show HN: Cobble – A hard daily word game

https://wilf.live/cobble/
15•wolfred•4h ago•7 comments

Chain of thought monitorability: A new and fragile opportunity for AI safety

https://arxiv.org/abs/2507.11473
109•mfiguiere•14h ago•50 comments

Show HN: 0xDEAD//TYPE – A fast-paced typing shooter with retro vibes

https://0xdeadtype.theden.sh/
70•theden•4d ago•19 comments

Scanned piano rolls database

http://www.pianorollmusic.org/rolldatabase.php
37•bookofjoe•4d ago•10 comments

Weave (YC W25) is hiring an AI engineer

https://www.ycombinator.com/companies/weave-3/jobs/SqFnIFE-founding-ai-engineer
1•adchurch•12h ago

The battle for Britain’s first book of the month club

https://www.historytoday.com/archive/history-matters/battle-britains-first-book-month-club
9•samclemens•2d ago•1 comments
Open in hackernews

Scanned piano rolls database

http://www.pianorollmusic.org/rolldatabase.php
37•bookofjoe•4d ago

Comments

irrational•7h ago
It’s dead Jim.

I assume we hugged it to death.

ncr100•7h 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•6h 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•6h ago
Awesome.

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

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

bluGill•6h 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•6h 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•5h 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•3h ago
Just curious, what made you go down that rabbit hole?
zulko•3h 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...

prvc•2m 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, as past attempts have done.

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