---
title: "Kyutai's MuScriptor Doubles Open-Source Music Transcription Accuracy to 48.2 F1"
subtitle: "Kyutai and Mirelo's open transcription model now exports editable sheet music and guitar tabs, on top of streaming per-instrument MIDI."
url: "https://alphasignal.ai/news/kyutai-s-muscriptor-doubles-open-source-music-transcription-accuracy-to-48-2-f1"
author: "AlphaSignal Newsroom"
author_url: "https://alphasignal.ai/editorial-team"
company: "AlphaSignal"
company_url: "https://alphasignal.ai/company/alphasignal"
published: "2026-08-20T14:58:30.000Z"
updated: "2026-08-22T02:51:51.529Z"
type: "Repo"
topics:
  - "Audio"
  - "Open Source"
subtopics:
  - "Music Generation"
upvotes: 384
source_url: "https://github.com/muscriptor/muscriptor"
comments: 0
truncated: true
---

# Kyutai's MuScriptor Doubles Open-Source Music Transcription Accuracy to 48.2 F1

> Kyutai and Mirelo's open transcription model now exports editable sheet music and guitar tabs, on top of streaming per-instrument MIDI.

Automatic music transcription has been chronically half-solved. Drop a full band mix into most tools and you get back a smeared piano roll that fuses drums, bass, guitar, and vocals into one unreadable blob. [MuScriptor](https://github.com/muscriptor/muscriptor), a joint model from Kyutai and Mirelo, was released to fix that, and it just got a practical upgrade: sheet music and guitar tabs, not only MIDI.

The pipeline exports both PDFs and editable MusicXML, so output drops straight into notation software without hand re-engraving. Under the hood, the team generates scores from MIDI using MuseScore plus custom preprocessing to clean up rhythm and layout. Everything runs from the same open-source repo, and you can try it in the browser at [muscriptor.kyutai.org](https://muscriptor.kyutai.org) or self-host locally.

![Multi-instrument score showing electric guitar, bass, drums, and vocals parts transcribed by MuScriptor](https://github.com/user-attachments/assets/16ebd78b-2e52-47fc-b149-96c507adfb3e) 

## What's actually under the hood

MuScriptor is a decoder-only Transformer for music transcription. It reads a mel-spectrogram of a short audio segment, then autoregressively predicts MIDI-like tokens for pitch, timing, and instrument, turning transcription into a language-modeling task following the MT3 tokenization scheme. Feed it a recording in any genre (pop, classical, metal, jazz) and it transcribes the notes played by every instrument into MIDI, without needing to know in advance what instruments are present.

_Preview only. Full text requires an AlphaSignal Pro account._

## Sources

- [muscriptor/muscriptor GitHub](https://github.com/muscriptor/muscriptor)
- [MuScriptor paper on arXiv](https://arxiv.org/abs/2607.08168)
- [Kyutai MuScriptor collection on Hugging Face](https://huggingface.co/collections/kyutai/muscriptor)
- [MarkTechPost coverage of MuScriptor](https://www.marktechpost.com/2026/07/10/kyutai-releases-muscriptor-an-open-weight-decoder-only-transformer-for-multi-instrument-music-transcription-to-midi/)
- [AI Weekly on MuScriptor release](https://aiweekly.co/alerts/kyutai-releases-muscriptor-for-multi-instrument-transcription)