No known security advisories.
The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.
music21 has 356K monthly downloads and 3K GitHub stars. Version 10.5.0 supports Python 3.11+, first published in 2010.
It is actively maintained under a permissive license, last released in Jun 2026.
It is built on top of chardet, joblib and jsonpickle. It is used by 78 tracked packages, including converter21, fudstop and crim-intervals.
Package Insights
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
100
Popularity
74
Adoption
95
Community
80
Provenance
0
How the maintenance status was determined
Last commit
5 days ago
Monthly downloads
355,740
•
Active
Activity within 30 days
Stable
Activity within 31-180 days
Minimal
Activity within 181-365 days, or no activity data
At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
355,740
Stars
2,525
Stars per 1k downloads
7.10
Industry Standard
> 10,000,000 monthly downloads
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
•
Community Favorite
> 5 stars per 1k downloads
Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
15,855
Month daily avg
11,858
Momentum
+33.7%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100Python version support tiers
requires_python
>=3.11
Cutting Edge
Minimum supported version is 3.12 or newer
•
Modern
Minimum supported version is 3.9, 3.10, or 3.11
Legacy
Supports 3.8 or older (or Python 2)
Unknown
No requires_python specified or unparseable
License categories
License
BSD-3-Clause
•
Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
20 days ago
Total releases
55
Releases/year
3.4
Rapid
Last release within 365 days and > 12 releases/year
•
Regular
Last release within 365 days
Slow
Last release 366-730 days ago
Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
110
Monthly downloads
355,740
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
•
Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
72
Issue Burden
57.0
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
24.9%
contrib / forks
Stale Release
No
PR Velocity
Quiet
Weekly Downloads
GitHub Stars
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.
Downloads by OS
Linux
8.9K
Windows
607
macOS
424
Python Versions
3.12
44.2%
4.4K
3.11
17.8%
1.8K
3.13
17.2%
1.7K
3.10
11.9%
1.2K
3.14
8.9%
882
Top Countries
1.
US
16.4K
US
2.
DK
1.8K
DK
3.
SE
333
SE
4.
CN
129
CN
5.
SG
105
SG
6.
DE
104
DE
7.
JP
102
JP
8.
FR
66
FR
9.
KR
62
KR
10.
ES
54
ES
Dependencies
8
- chardet
- joblib
- jsonpickle
- matplotlib
- more-itertools
- numpy >=1.26.4
- requests
- webcolors >=1.5
2 optional dependencies
- python-levenshtein[extras]
- scipy[extras]
Used By
78
- converter21
- fudstop
- crim-intervals
- music-drummer
- deepbach-pytorch
- musicntwrk
- accordoai
- music-bassline-generator
- libfmp
- orpheuspypractice
- accompy
- jgcmlib
- camat
- musicdiff
- tonal
- synctoolbox
- remi-z
- drumscript
- integerbook
- cadence-detector
- webull-options
- harte-library
- amads
- harmony-midi-token
- pitchcontext
- musicxml-to-png
- music-tonnetztransform
- pydactyl
- music21-tools
- link2abc
- justkeydding
- kontour
- smw-music
- mktdata
- dorico-mcp-server
- cavatina
- music-benchmark
- musicgen
- tritone-rotations
- pitchscapes
- chrombigram
- kithairon-canon
- truffle-ai-music-creator-mcp
- reaper-mcp
- imat
- musicgen-trainer
- flexinfer-chiptune
- muprocdurham
- pitchbench
- blobopera
Package Information
License
BSD-3-Clause
First Release
May 7, 2010
Last Release
2 weeks ago
Last Commit
6 days ago
Latest Version
10.5.0
Total Releases
55
Contributors
110
Open PRs
10
Archived
No
Python Versions
3.11
3.12
3.13
3.14
Wheels
py3
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh