Lastgenre finds classifies children music as metal

[guerda]

Problem

The lastgenre plugin identifies multiple children music albums as metal (Melodic Death Metal and Grindcore).

$ beet lastgenre Kinderlieder
lastgenre: genre for album Various Artists - Best of Kinderlieder, Volume 02 (artist): Grindcore
lastgenre: genre for album Various Artists - Die 50 schönsten Kinderlieder (artist): Melodic Death Metal

Both album had no tags:
https://www.last.fm/music/Various+Artists/Best+of+Kinderlieder,+Volume+02
https://www.last.fm/music/Various+Artists/Die+50+sch%C3%B6nsten+Kinderlieder

and still they are classified as metal subgenres, which is amittedly funny, but not correct at all.
Adding a tag to one of the albums didn't solve the problem.

Running this command in verbose (-vv) mode:

$ beet -vv
$ beet -vv
user configuration: /home/pi/.config/beets/config.yaml
data directory: /home/pi/.config/beets
plugin paths:
lastgenre: Loading canonicalization tree /home/pi/.local/pipx/venvs/beets/lib/python3.11/site-packages/beetsplug/lastgenre/genres-tree.yaml
fetchart: google: Disabling art source due to missing key
fetchart: lastfm: Disabling art source due to missing key
Sending event: pluginload
library database: /home/pi/.beets/musiclibrary.db
library directory: /media/music
Sending event: library_opened
Usage:
...

Setup

• OS: Raspberry Pi OS, Debian 12.9
• Python version: 3.11.2
• beets version: 2.2.0
• Turning off plugins made problem go away (yes/no): no

[jackwilsdon]

Can you provide the output of beet -vvv lastgenre Kinderlieder?

[guerda]

user configuration: /home/pi/.config/beets/config.yaml
data directory: /home/pi/.config/beets
plugin paths: 
lastgenre: Loading canonicalization tree /home/pi/.local/pipx/venvs/beets/lib/python3.11/site-packages/beetsplug/lastgenre/genres-tree.yaml
fetchart: google: Disabling art source due to missing key
fetchart: lastfm: Disabling art source due to missing key
Sending event: pluginload
library database: /home/pi/.beets/musiclibrary.db
library directory: /media/music
Sending event: library_opened
Parsed query: AndQuery([AnyFieldQuery('Kinderlieder', ('album', 'albumartist', 'genre'), SubstringQuery)])
Parsed sort: NullSort()
lastgenre: last.fm error: Album not found
lastgenre: genre for album Oliver Mager - Die erfolgreichsten Kinderlieder Vol. 1 (artist): Schlager
Sending event: database_change
Sending event: database_change
Sending event: write
Sending event: after_write
lastgenre: genre for album Various Artists - Best of Kinderlieder, Volume 02 (artist): Grindcore
Sending event: database_change
Sending event: database_change
Sending event: write
Sending event: after_write
lastgenre: genre for album Various Artists - Die 50 schönsten Kinderlieder (artist): Melodic Death Metal
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: database_change
Sending event: write
Sending event: after_write
Sending event: write
Sending event: after_write
Sending event: write
Sending event: after_write
Sending event: write
Sending event: after_write
Sending event: write
Sending event: after_write
Sending event: write
Sending event: after_write
Sending event: write
Sending event: after_write
Sending event: write

[guerda]

Any idea how that happened? I would understand it if there was a tag, but this album does not have any tag on it.

The only explanation I would have is that I ripped that album via abcde. Maybe there they set a default genre, but I don't know why lastgenre would pick this up

[snejus]

Hey @guerda,

It looks like the issue is due to your configuration telling the plugin to fetch the artist's genre. Check out the parentheses in this example:

lastgenre: genre for album Various Artists - Best of Kinderlieder, Volume 02 (artist): Grindcore

Since Various Artists is a pretty generic tag, it's returning an irrelevant genre.

You might want to tweak the lastgenre.source configuration option. You can find more info in the plugin docs.

Also, I think our logs could be simplified. Instead of logging the full album name, just showing Various Artists would be clearer and less confusing.